1 step: libcurl static link

git-svn-id: http://svn.miranda-ng.org/main/trunk@3763 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c

1 files changed, 3490 insertions, 0 deletions

diff --git a/plugins/FTPFileYM/curl-7.29.0/lib/http.c b/plugins/FTPFileYM/curl-7.29.0/lib/http.c
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+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#ifndef CURL_DISABLE_HTTP
+
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#ifdef HAVE_NET_IF_H
+#include <net/if.h>
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
+#include "urldata.h"
+#include <curl/curl.h>
+#include "transfer.h"
+#include "sendf.h"
+#include "formdata.h"
+#include "progress.h"
+#include "curl_base64.h"
+#include "cookie.h"
+#include "strequal.h"
+#include "sslgen.h"
+#include "http_digest.h"
+#include "curl_ntlm.h"
+#include "curl_ntlm_wb.h"
+#include "http_negotiate.h"
+#include "url.h"
+#include "share.h"
+#include "hostip.h"
+#include "http.h"
+#include "curl_memory.h"
+#include "select.h"
+#include "parsedate.h" /* for the week day and month names */
+#include "strtoofft.h"
+#include "multiif.h"
+#include "rawstr.h"
+#include "content_encoding.h"
+#include "http_proxy.h"
+#include "warnless.h"
+#include "non-ascii.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+/* The last #include file should be: */
+#include "memdebug.h"
+
+/*
+ * Forward declarations.
+ */
+
+static int http_getsock_do(struct connectdata *conn,
+                           curl_socket_t *socks,
+                           int numsocks);
+static int http_should_fail(struct connectdata *conn);
+
+#ifdef USE_SSL
+static CURLcode https_connecting(struct connectdata *conn, bool *done);
+static int https_getsock(struct connectdata *conn,
+                         curl_socket_t *socks,
+                         int numsocks);
+#else
+#define https_connecting(x,y) CURLE_COULDNT_CONNECT
+#endif
+
+/*
+ * HTTP handler interface.
+ */
+const struct Curl_handler Curl_handler_http = {
+  "HTTP",                               /* scheme */
+  ZERO_NULL,                            /* setup_connection */
+  Curl_http,                            /* do_it */
+  Curl_http_done,                       /* done */
+  ZERO_NULL,                            /* do_more */
+  Curl_http_connect,                    /* connect_it */
+  ZERO_NULL,                            /* connecting */
+  ZERO_NULL,                            /* doing */
+  ZERO_NULL,                            /* proto_getsock */
+  http_getsock_do,                      /* doing_getsock */
+  ZERO_NULL,                            /* domore_getsock */
+  ZERO_NULL,                            /* perform_getsock */
+  ZERO_NULL,                            /* disconnect */
+  ZERO_NULL,                            /* readwrite */
+  PORT_HTTP,                            /* defport */
+  CURLPROTO_HTTP,                       /* protocol */
+  PROTOPT_NONE                          /* flags */
+};
+
+#ifdef USE_SSL
+/*
+ * HTTPS handler interface.
+ */
+const struct Curl_handler Curl_handler_https = {
+  "HTTPS",                              /* scheme */
+  ZERO_NULL,                            /* setup_connection */
+  Curl_http,                            /* do_it */
+  Curl_http_done,                       /* done */
+  ZERO_NULL,                            /* do_more */
+  Curl_http_connect,                    /* connect_it */
+  https_connecting,                     /* connecting */
+  ZERO_NULL,                            /* doing */
+  https_getsock,                        /* proto_getsock */
+  http_getsock_do,                      /* doing_getsock */
+  ZERO_NULL,                            /* domore_getsock */
+  ZERO_NULL,                            /* perform_getsock */
+  ZERO_NULL,                            /* disconnect */
+  ZERO_NULL,                            /* readwrite */
+  PORT_HTTPS,                           /* defport */
+  CURLPROTO_HTTP | CURLPROTO_HTTPS,     /* protocol */
+  PROTOPT_SSL                           /* flags */
+};
+#endif
+
+
+/*
+ * checkheaders() checks the linked list of custom HTTP headers for a
+ * particular header (prefix).
+ *
+ * Returns a pointer to the first matching header or NULL if none matched.
+ */
+char *Curl_checkheaders(struct SessionHandle *data, const char *thisheader)
+{
+  struct curl_slist *head;
+  size_t thislen = strlen(thisheader);
+
+  for(head = data->set.headers; head; head=head->next) {
+    if(Curl_raw_nequal(head->data, thisheader, thislen))
+      return head->data;
+  }
+  return NULL;
+}
+
+/*
+ * Strip off leading and trailing whitespace from the value in the
+ * given HTTP header line and return a strdupped copy. Returns NULL in
+ * case of allocation failure. Returns an empty string if the header value
+ * consists entirely of whitespace.
+ */
+static char *copy_header_value(const char *h)
+{
+  const char *start;
+  const char *end;
+  char *value;
+  size_t len;
+
+  DEBUGASSERT(h);
+
+  /* Find the end of the header name */
+  while(*h && (*h != ':'))
+    ++h;
+
+  if(*h)
+    /* Skip over colon */
+    ++h;
+
+  /* Find the first non-space letter */
+  start = h;
+  while(*start && ISSPACE(*start))
+    start++;
+
+  /* data is in the host encoding so
+     use '\r' and '\n' instead of 0x0d and 0x0a */
+  end = strchr(start, '\r');
+  if(!end)
+    end = strchr(start, '\n');
+  if(!end)
+    end = strchr(start, '\0');
+  if(!end)
+    return NULL;
+
+  /* skip all trailing space letters */
+  while((end > start) && ISSPACE(*end))
+    end--;
+
+  /* get length of the type */
+  len = end-start+1;
+
+  value = malloc(len + 1);
+  if(!value)
+    return NULL;
+
+  memcpy(value, start, len);
+  value[len] = 0; /* zero terminate */
+
+  return value;
+}
+
+/*
+ * http_output_basic() sets up an Authorization: header (or the proxy version)
+ * for HTTP Basic authentication.
+ *
+ * Returns CURLcode.
+ */
+static CURLcode http_output_basic(struct connectdata *conn, bool proxy)
+{
+  size_t size = 0;
+  char *authorization = NULL;
+  struct SessionHandle *data = conn->data;
+  char **userp;
+  const char *user;
+  const char *pwd;
+  CURLcode error;
+
+  if(proxy) {
+    userp = &conn->allocptr.proxyuserpwd;
+    user = conn->proxyuser;
+    pwd = conn->proxypasswd;
+  }
+  else {
+    userp = &conn->allocptr.userpwd;
+    user = conn->user;
+    pwd = conn->passwd;
+  }
+
+  snprintf(data->state.buffer, sizeof(data->state.buffer), "%s:%s", user, pwd);
+
+  error = Curl_base64_encode(data,
+                             data->state.buffer, strlen(data->state.buffer),
+                             &authorization, &size);
+  if(error)
+    return error;
+
+  if(!authorization)
+    return CURLE_REMOTE_ACCESS_DENIED;
+
+  Curl_safefree(*userp);
+  *userp = aprintf("%sAuthorization: Basic %s\r\n",
+                   proxy?"Proxy-":"",
+                   authorization);
+  free(authorization);
+  if(!*userp)
+    return CURLE_OUT_OF_MEMORY;
+
+  return CURLE_OK;
+}
+
+/* pickoneauth() selects the most favourable authentication method from the
+ * ones available and the ones we want.
+ *
+ * return TRUE if one was picked
+ */
+static bool pickoneauth(struct auth *pick)
+{
+  bool picked;
+  /* only deal with authentication we want */
+  unsigned long avail = pick->avail & pick->want;
+  picked = TRUE;
+
+  /* The order of these checks is highly relevant, as this will be the order
+     of preference in case of the existence of multiple accepted types. */
+  if(avail & CURLAUTH_GSSNEGOTIATE)
+    pick->picked = CURLAUTH_GSSNEGOTIATE;
+  else if(avail & CURLAUTH_DIGEST)
+    pick->picked = CURLAUTH_DIGEST;
+  else if(avail & CURLAUTH_NTLM)
+    pick->picked = CURLAUTH_NTLM;
+  else if(avail & CURLAUTH_NTLM_WB)
+    pick->picked = CURLAUTH_NTLM_WB;
+  else if(avail & CURLAUTH_BASIC)
+    pick->picked = CURLAUTH_BASIC;
+  else {
+    pick->picked = CURLAUTH_PICKNONE; /* we select to use nothing */
+    picked = FALSE;
+  }
+  pick->avail = CURLAUTH_NONE; /* clear it here */
+
+  return picked;
+}
+
+/*
+ * Curl_http_perhapsrewind()
+ *
+ * If we are doing POST or PUT {
+ *   If we have more data to send {
+ *     If we are doing NTLM {
+ *       Keep sending since we must not disconnect
+ *     }
+ *     else {
+ *       If there is more than just a little data left to send, close
+ *       the current connection by force.
+ *     }
+ *   }
+ *   If we have sent any data {
+ *     If we don't have track of all the data {
+ *       call app to tell it to rewind
+ *     }
+ *     else {
+ *       rewind internally so that the operation can restart fine
+ *     }
+ *   }
+ * }
+ */
+static CURLcode http_perhapsrewind(struct connectdata *conn)
+{
+  struct SessionHandle *data = conn->data;
+  struct HTTP *http = data->state.proto.http;
+  curl_off_t bytessent;
+  curl_off_t expectsend = -1; /* default is unknown */
+
+  if(!http)
+    /* If this is still NULL, we have not reach very far and we can safely
+       skip this rewinding stuff */
+    return CURLE_OK;
+
+  switch(data->set.httpreq) {
+  case HTTPREQ_GET:
+  case HTTPREQ_HEAD:
+    return CURLE_OK;
+  default:
+    break;
+  }
+
+  bytessent = http->writebytecount;
+
+  if(conn->bits.authneg)
+    /* This is a state where we are known to be negotiating and we don't send
+       any data then. */
+    expectsend = 0;
+  else {
+    /* figure out how much data we are expected to send */
+    switch(data->set.httpreq) {
+    case HTTPREQ_POST:
+      if(data->set.postfieldsize != -1)
+        expectsend = data->set.postfieldsize;
+      else if(data->set.postfields)
+        expectsend = (curl_off_t)strlen(data->set.postfields);
+      break;
+    case HTTPREQ_PUT:
+      if(data->set.infilesize != -1)
+        expectsend = data->set.infilesize;
+      break;
+    case HTTPREQ_POST_FORM:
+      expectsend = http->postsize;
+      break;
+    default:
+      break;
+    }
+  }
+
+  conn->bits.rewindaftersend = FALSE; /* default */
+
+  if((expectsend == -1) || (expectsend > bytessent)) {
+    /* There is still data left to send */
+    if((data->state.authproxy.picked == CURLAUTH_NTLM) ||
+       (data->state.authhost.picked == CURLAUTH_NTLM) ||
+       (data->state.authproxy.picked == CURLAUTH_NTLM_WB) ||
+       (data->state.authhost.picked == CURLAUTH_NTLM_WB)) {
+      if(((expectsend - bytessent) < 2000) ||
+         (conn->ntlm.state != NTLMSTATE_NONE) ||
+         (conn->proxyntlm.state != NTLMSTATE_NONE)) {
+        /* The NTLM-negotiation has started *OR* there is just a little (<2K)
+           data left to send, keep on sending. */
+
+        /* rewind data when completely done sending! */
+        if(!conn->bits.authneg) {
+          conn->bits.rewindaftersend = TRUE;
+          infof(data, "Rewind stream after send\n");
+        }
+
+        return CURLE_OK;
+      }
+      if(conn->bits.close)
+        /* this is already marked to get closed */
+        return CURLE_OK;
+
+      infof(data, "NTLM send, close instead of sending %" FORMAT_OFF_T
+            " bytes\n", (curl_off_t)(expectsend - bytessent));
+    }
+
+    /* This is not NTLM or many bytes left to send: close
+     */
+    conn->bits.close = TRUE;
+    data->req.size = 0; /* don't download any more than 0 bytes */
+
+    /* There still is data left to send, but this connection is marked for
+       closure so we can safely do the rewind right now */
+  }
+
+  if(bytessent)
+    /* we rewind now at once since if we already sent something */
+    return Curl_readrewind(conn);
+
+  return CURLE_OK;
+}
+
+/*
+ * Curl_http_auth_act() gets called when all HTTP headers have been received
+ * and it checks what authentication methods that are available and decides
+ * which one (if any) to use. It will set 'newurl' if an auth method was
+ * picked.
+ */
+
+CURLcode Curl_http_auth_act(struct connectdata *conn)
+{
+  struct SessionHandle *data = conn->data;
+  bool pickhost = FALSE;
+  bool pickproxy = FALSE;
+  CURLcode code = CURLE_OK;
+
+  if(100 <= data->req.httpcode && 199 >= data->req.httpcode)
+    /* this is a transient response code, ignore */
+    return CURLE_OK;
+
+  if(data->state.authproblem)
+    return data->set.http_fail_on_error?CURLE_HTTP_RETURNED_ERROR:CURLE_OK;
+
+  if(conn->bits.user_passwd &&
+     ((data->req.httpcode == 401) ||
+      (conn->bits.authneg && data->req.httpcode < 300))) {
+    pickhost = pickoneauth(&data->state.authhost);
+    if(!pickhost)
+      data->state.authproblem = TRUE;
+  }
+  if(conn->bits.proxy_user_passwd &&
+     ((data->req.httpcode == 407) ||
+      (conn->bits.authneg && data->req.httpcode < 300))) {
+    pickproxy = pickoneauth(&data->state.authproxy);
+    if(!pickproxy)
+      data->state.authproblem = TRUE;
+  }
+
+  if(pickhost || pickproxy) {
+    /* In case this is GSS auth, the newurl field is already allocated so
+       we must make sure to free it before allocating a new one. As figured
+       out in bug #2284386 */
+    Curl_safefree(data->req.newurl);
+    data->req.newurl = strdup(data->change.url); /* clone URL */
+    if(!data->req.newurl)
+      return CURLE_OUT_OF_MEMORY;
+
+    if((data->set.httpreq != HTTPREQ_GET) &&
+       (data->set.httpreq != HTTPREQ_HEAD) &&
+       !conn->bits.rewindaftersend) {
+      code = http_perhapsrewind(conn);
+      if(code)
+        return code;
+    }
+  }
+
+  else if((data->req.httpcode < 300) &&
+          (!data->state.authhost.done) &&
+          conn->bits.authneg) {
+    /* no (known) authentication available,
+       authentication is not "done" yet and
+       no authentication seems to be required and
+       we didn't try HEAD or GET */
+    if((data->set.httpreq != HTTPREQ_GET) &&
+       (data->set.httpreq != HTTPREQ_HEAD)) {
+      data->req.newurl = strdup(data->change.url); /* clone URL */
+      if(!data->req.newurl)
+        return CURLE_OUT_OF_MEMORY;
+      data->state.authhost.done = TRUE;
+    }
+  }
+  if(http_should_fail(conn)) {
+    failf (data, "The requested URL returned error: %d",
+           data->req.httpcode);
+    code = CURLE_HTTP_RETURNED_ERROR;
+  }
+
+  return code;
+}
+
+
+/*
+ * Output the correct authentication header depending on the auth type
+ * and whether or not it is to a proxy.
+ */
+static CURLcode
+output_auth_headers(struct connectdata *conn,
+                    struct auth *authstatus,
+                    const char *request,
+                    const char *path,
+                    bool proxy)
+{
+  struct SessionHandle *data = conn->data;
+  const char *auth=NULL;
+  CURLcode result = CURLE_OK;
+#ifdef USE_HTTP_NEGOTIATE
+  struct negotiatedata *negdata = proxy?
+    &data->state.proxyneg:&data->state.negotiate;
+#endif
+
+#ifdef CURL_DISABLE_CRYPTO_AUTH
+  (void)request;
+  (void)path;
+#endif
+
+#ifdef USE_HTTP_NEGOTIATE
+  negdata->state = GSS_AUTHNONE;
+  if((authstatus->picked == CURLAUTH_GSSNEGOTIATE) &&
+     negdata->context && !GSS_ERROR(negdata->status)) {
+    auth="GSS-Negotiate";
+    result = Curl_output_negotiate(conn, proxy);
+    if(result)
+      return result;
+    authstatus->done = TRUE;
+    negdata->state = GSS_AUTHSENT;
+  }
+  else
+#endif
+#ifdef USE_NTLM
+  if(authstatus->picked == CURLAUTH_NTLM) {
+    auth="NTLM";
+    result = Curl_output_ntlm(conn, proxy);
+    if(result)
+      return result;
+  }
+  else
+#endif
+#if defined(USE_NTLM) && defined(NTLM_WB_ENABLED)
+  if(authstatus->picked == CURLAUTH_NTLM_WB) {
+    auth="NTLM_WB";
+    result = Curl_output_ntlm_wb(conn, proxy);
+    if(result)
+      return result;
+  }
+  else
+#endif
+#ifndef CURL_DISABLE_CRYPTO_AUTH
+  if(authstatus->picked == CURLAUTH_DIGEST) {
+    auth="Digest";
+    result = Curl_output_digest(conn,
+                                proxy,
+                                (const unsigned char *)request,
+                                (const unsigned char *)path);
+    if(result)
+      return result;
+  }
+  else
+#endif
+  if(authstatus->picked == CURLAUTH_BASIC) {
+    /* Basic */
+    if((proxy && conn->bits.proxy_user_passwd &&
+       !Curl_checkheaders(data, "Proxy-authorization:")) ||
+       (!proxy && conn->bits.user_passwd &&
+       !Curl_checkheaders(data, "Authorization:"))) {
+      auth="Basic";
+      result = http_output_basic(conn, proxy);
+      if(result)
+        return result;
+    }
+    /* NOTE: this function should set 'done' TRUE, as the other auth
+       functions work that way */
+    authstatus->done = TRUE;
+  }
+
+  if(auth) {
+    infof(data, "%s auth using %s with user '%s'\n",
+          proxy?"Proxy":"Server", auth,
+          proxy?(conn->proxyuser?conn->proxyuser:""):
+                (conn->user?conn->user:""));
+    authstatus->multi = (!authstatus->done) ? TRUE : FALSE;
+  }
+  else
+    authstatus->multi = FALSE;
+
+  return CURLE_OK;
+}
+
+/**
+ * Curl_http_output_auth() setups the authentication headers for the
+ * host/proxy and the correct authentication
+ * method. conn->data->state.authdone is set to TRUE when authentication is
+ * done.
+ *
+ * @param conn all information about the current connection
+ * @param request pointer to the request keyword
+ * @param path pointer to the requested path
+ * @param proxytunnel boolean if this is the request setting up a "proxy
+ * tunnel"
+ *
+ * @returns CURLcode
+ */
+CURLcode
+Curl_http_output_auth(struct connectdata *conn,
+                      const char *request,
+                      const char *path,
+                      bool proxytunnel) /* TRUE if this is the request setting
+                                           up the proxy tunnel */
+{
+  CURLcode result = CURLE_OK;
+  struct SessionHandle *data = conn->data;
+  struct auth *authhost;
+  struct auth *authproxy;
+
+  DEBUGASSERT(data);
+
+  authhost = &data->state.authhost;
+  authproxy = &data->state.authproxy;
+
+  if((conn->bits.httpproxy && conn->bits.proxy_user_passwd) ||
+     conn->bits.user_passwd)
+    /* continue please */ ;
+  else {
+    authhost->done = TRUE;
+    authproxy->done = TRUE;
+    return CURLE_OK; /* no authentication with no user or password */
+  }
+
+  if(authhost->want && !authhost->picked)
+    /* The app has selected one or more methods, but none has been picked
+       so far by a server round-trip. Then we set the picked one to the
+       want one, and if this is one single bit it'll be used instantly. */
+    authhost->picked = authhost->want;
+
+  if(authproxy->want && !authproxy->picked)
+    /* The app has selected one or more methods, but none has been picked so
+       far by a proxy round-trip. Then we set the picked one to the want one,
+       and if this is one single bit it'll be used instantly. */
+    authproxy->picked = authproxy->want;
+
+#ifndef CURL_DISABLE_PROXY
+  /* Send proxy authentication header if needed */
+  if(conn->bits.httpproxy &&
+      (conn->bits.tunnel_proxy == proxytunnel)) {
+    result = output_auth_headers(conn, authproxy, request, path, TRUE);
+    if(result)
+      return result;
+  }
+  else
+#else
+  (void)proxytunnel;
+#endif /* CURL_DISABLE_PROXY */
+    /* we have no proxy so let's pretend we're done authenticating
+       with it */
+    authproxy->done = TRUE;
+
+  /* To prevent the user+password to get sent to other than the original
+     host due to a location-follow, we do some weirdo checks here */
+  if(!data->state.this_is_a_follow ||
+     conn->bits.netrc ||
+     !data->state.first_host ||
+     data->set.http_disable_hostname_check_before_authentication ||
+     Curl_raw_equal(data->state.first_host, conn->host.name)) {
+    result = output_auth_headers(conn, authhost, request, path, FALSE);
+  }
+  else
+    authhost->done = TRUE;
+
+  return result;
+}
+
+
+/*
+ * Curl_http_input_auth() deals with Proxy-Authenticate: and WWW-Authenticate:
+ * headers. They are dealt with both in the transfer.c main loop and in the
+ * proxy CONNECT loop.
+ */
+
+CURLcode Curl_http_input_auth(struct connectdata *conn,
+                              int httpcode,
+                              const char *header) /* the first non-space */
+{
+  /*
+   * This resource requires authentication
+   */
+  struct SessionHandle *data = conn->data;
+
+  unsigned long *availp;
+  const char *start;
+  struct auth *authp;
+
+  if(httpcode == 407) {
+    start = header+strlen("Proxy-authenticate:");
+    availp = &data->info.proxyauthavail;
+    authp = &data->state.authproxy;
+  }
+  else {
+    start = header+strlen("WWW-Authenticate:");
+    availp = &data->info.httpauthavail;
+    authp = &data->state.authhost;
+  }
+
+  /* pass all white spaces */
+  while(*start && ISSPACE(*start))
+    start++;
+
+  /*
+   * Here we check if we want the specific single authentication (using ==) and
+   * if we do, we initiate usage of it.
+   *
+   * If the provided authentication is wanted as one out of several accepted
+   * types (using &), we OR this authentication type to the authavail
+   * variable.
+   *
+   * Note:
+   *
+   * ->picked is first set to the 'want' value (one or more bits) before the
+   * request is sent, and then it is again set _after_ all response 401/407
+   * headers have been received but then only to a single preferred method
+   * (bit).
+   *
+   */
+
+  while(*start) {
+#ifdef USE_HTTP_NEGOTIATE
+    if(checkprefix("GSS-Negotiate", start) ||
+       checkprefix("Negotiate", start)) {
+      int neg;
+      *availp |= CURLAUTH_GSSNEGOTIATE;
+      authp->avail |= CURLAUTH_GSSNEGOTIATE;
+
+      if(authp->picked == CURLAUTH_GSSNEGOTIATE) {
+        if(data->state.negotiate.state == GSS_AUTHSENT) {
+          /* if we sent GSS authentication in the outgoing request and we get
+             this back, we're in trouble */
+          infof(data, "Authentication problem. Ignoring this.\n");
+          data->state.authproblem = TRUE;
+        }
+        else {
+          neg = Curl_input_negotiate(conn, (bool)(httpcode == 407), start);
+          if(neg == 0) {
+            DEBUGASSERT(!data->req.newurl);
+            data->req.newurl = strdup(data->change.url);
+            if(!data->req.newurl)
+              return CURLE_OUT_OF_MEMORY;
+            data->state.authproblem = FALSE;
+            /* we received GSS auth info and we dealt with it fine */
+            data->state.negotiate.state = GSS_AUTHRECV;
+          }
+          else
+            data->state.authproblem = TRUE;
+        }
+      }
+    }
+    else
+#endif
+#ifdef USE_NTLM
+      /* NTLM support requires the SSL crypto libs */
+      if(checkprefix("NTLM", start)) {
+        *availp |= CURLAUTH_NTLM;
+        authp->avail |= CURLAUTH_NTLM;
+        if(authp->picked == CURLAUTH_NTLM ||
+           authp->picked == CURLAUTH_NTLM_WB) {
+          /* NTLM authentication is picked and activated */
+          CURLcode ntlm =
+            Curl_input_ntlm(conn, (httpcode == 407)?TRUE:FALSE, start);
+          if(CURLE_OK == ntlm) {
+            data->state.authproblem = FALSE;
+#ifdef NTLM_WB_ENABLED
+            if(authp->picked == CURLAUTH_NTLM_WB) {
+              *availp &= ~CURLAUTH_NTLM;
+              authp->avail &= ~CURLAUTH_NTLM;
+              *availp |= CURLAUTH_NTLM_WB;
+              authp->avail |= CURLAUTH_NTLM_WB;
+
+              /* Get the challenge-message which will be passed to
+               * ntlm_auth for generating the type 3 message later */
+              while(*start && ISSPACE(*start))
+                start++;
+              if(checkprefix("NTLM", start)) {
+                start += strlen("NTLM");
+                while(*start && ISSPACE(*start))
+                  start++;
+                if(*start)
+                  if((conn->challenge_header = strdup(start)) == NULL)
+                    return CURLE_OUT_OF_MEMORY;
+              }
+            }
+#endif
+          }
+          else {
+            infof(data, "Authentication problem. Ignoring this.\n");
+            data->state.authproblem = TRUE;
+          }
+        }
+      }
+      else
+#endif
+#ifndef CURL_DISABLE_CRYPTO_AUTH
+        if(checkprefix("Digest", start)) {
+          if((authp->avail & CURLAUTH_DIGEST) != 0) {
+            infof(data, "Ignoring duplicate digest auth header.\n");
+          }
+          else {
+            CURLdigest dig;
+            *availp |= CURLAUTH_DIGEST;
+            authp->avail |= CURLAUTH_DIGEST;
+
+            /* We call this function on input Digest headers even if Digest
+             * authentication isn't activated yet, as we need to store the
+             * incoming data from this header in case we are gonna use
+             * Digest. */
+            dig = Curl_input_digest(conn, (httpcode == 407)?TRUE:FALSE, start);
+
+            if(CURLDIGEST_FINE != dig) {
+              infof(data, "Authentication problem. Ignoring this.\n");
+              data->state.authproblem = TRUE;
+            }
+          }
+        }
+        else
+#endif
+          if(checkprefix("Basic", start)) {
+            *availp |= CURLAUTH_BASIC;
+            authp->avail |= CURLAUTH_BASIC;
+            if(authp->picked == CURLAUTH_BASIC) {
+              /* We asked for Basic authentication but got a 40X back
+                 anyway, which basically means our name+password isn't
+                 valid. */
+              authp->avail = CURLAUTH_NONE;
+              infof(data, "Authentication problem. Ignoring this.\n");
+              data->state.authproblem = TRUE;
+            }
+          }
+
+    /* there may be multiple methods on one line, so keep reading */
+    while(*start && *start != ',') /* read up to the next comma */
+      start++;
+    if(*start == ',') /* if we're on a comma, skip it */
+      start++;
+    while(*start && ISSPACE(*start))
+      start++;
+  }
+  return CURLE_OK;
+}
+
+/**
+ * http_should_fail() determines whether an HTTP response has gotten us
+ * into an error state or not.
+ *
+ * @param conn all information about the current connection
+ *
+ * @retval 0 communications should continue
+ *
+ * @retval 1 communications should not continue
+ */
+static int http_should_fail(struct connectdata *conn)
+{
+  struct SessionHandle *data;
+  int httpcode;
+
+  DEBUGASSERT(conn);
+  data = conn->data;
+  DEBUGASSERT(data);
+
+  httpcode = data->req.httpcode;
+
+  /*
+  ** If we haven't been asked to fail on error,
+  ** don't fail.
+  */
+  if(!data->set.http_fail_on_error)
+    return 0;
+
+  /*
+  ** Any code < 400 is never terminal.
+  */
+  if(httpcode < 400)
+    return 0;
+
+  if(data->state.resume_from &&
+     (data->set.httpreq==HTTPREQ_GET) &&
+     (httpcode == 416)) {
+    /* "Requested Range Not Satisfiable", just proceed and
+       pretend this is no error */
+    return 0;
+  }
+
+  /*
+  ** Any code >= 400 that's not 401 or 407 is always
+  ** a terminal error
+  */
+  if((httpcode != 401) &&
+      (httpcode != 407))
+    return 1;
+
+  /*
+  ** All we have left to deal with is 401 and 407
+  */
+  DEBUGASSERT((httpcode == 401) || (httpcode == 407));
+
+  /*
+  ** Examine the current authentication state to see if this
+  ** is an error.  The idea is for this function to get
+  ** called after processing all the headers in a response
+  ** message.  So, if we've been to asked to authenticate a
+  ** particular stage, and we've done it, we're OK.  But, if
+  ** we're already completely authenticated, it's not OK to
+  ** get another 401 or 407.
+  **
+  ** It is possible for authentication to go stale such that
+  ** the client needs to reauthenticate.  Once that info is
+  ** available, use it here.
+  */
+
+  /*
+  ** Either we're not authenticating, or we're supposed to
+  ** be authenticating something else.  This is an error.
+  */
+  if((httpcode == 401) && !conn->bits.user_passwd)
+    return TRUE;
+  if((httpcode == 407) && !conn->bits.proxy_user_passwd)
+    return TRUE;
+
+  return data->state.authproblem;
+}
+
+/*
+ * readmoredata() is a "fread() emulation" to provide POST and/or request
+ * data. It is used when a huge POST is to be made and the entire chunk wasn't
+ * sent in the first send(). This function will then be called from the
+ * transfer.c loop when more data is to be sent to the peer.
+ *
+ * Returns the amount of bytes it filled the buffer with.
+ */
+static size_t readmoredata(char *buffer,
+                           size_t size,
+                           size_t nitems,
+                           void *userp)
+{
+  struct connectdata *conn = (struct connectdata *)userp;
+  struct HTTP *http = conn->data->state.proto.http;
+  size_t fullsize = size * nitems;
+
+  if(0 == http->postsize)
+    /* nothing to return */
+    return 0;
+
+  /* make sure that a HTTP request is never sent away chunked! */
+  conn->data->req.forbidchunk = (http->sending == HTTPSEND_REQUEST)?TRUE:FALSE;
+
+  if(http->postsize <= (curl_off_t)fullsize) {
+    memcpy(buffer, http->postdata, (size_t)http->postsize);
+    fullsize = (size_t)http->postsize;
+
+    if(http->backup.postsize) {
+      /* move backup data into focus and continue on that */
+      http->postdata = http->backup.postdata;
+      http->postsize = http->backup.postsize;
+      conn->fread_func = http->backup.fread_func;
+      conn->fread_in = http->backup.fread_in;
+
+      http->sending++; /* move one step up */
+
+      http->backup.postsize=0;
+    }
+    else
+      http->postsize = 0;
+
+    return fullsize;
+  }
+
+  memcpy(buffer, http->postdata, fullsize);
+  http->postdata += fullsize;
+  http->postsize -= fullsize;
+
+  return fullsize;
+}
+
+/* ------------------------------------------------------------------------- */
+/* add_buffer functions */
+
+/*
+ * Curl_add_buffer_init() sets up and returns a fine buffer struct
+ */
+Curl_send_buffer *Curl_add_buffer_init(void)
+{
+  return calloc(1, sizeof(Curl_send_buffer));
+}
+
+/*
+ * Curl_add_buffer_send() sends a header buffer and frees all associated
+ * memory.  Body data may be appended to the header data if desired.
+ *
+ * Returns CURLcode
+ */
+CURLcode Curl_add_buffer_send(Curl_send_buffer *in,
+                              struct connectdata *conn,
+
+                               /* add the number of sent bytes to this
+                                  counter */
+                              long *bytes_written,
+
+                               /* how much of the buffer contains body data */
+                              size_t included_body_bytes,
+                              int socketindex)
+
+{
+  ssize_t amount;
+  CURLcode res;
+  char *ptr;
+  size_t size;
+  struct HTTP *http = conn->data->state.proto.http;
+  size_t sendsize;
+  curl_socket_t sockfd;
+  size_t headersize;
+
+  DEBUGASSERT(socketindex <= SECONDARYSOCKET);
+
+  sockfd = conn->sock[socketindex];
+
+  /* The looping below is required since we use non-blocking sockets, but due
+     to the circumstances we will just loop and try again and again etc */
+
+  ptr = in->buffer;
+  size = in->size_used;
+
+  headersize = size - included_body_bytes; /* the initial part that isn't body
+                                              is header */
+
+  DEBUGASSERT(size > included_body_bytes);
+
+  res = Curl_convert_to_network(conn->data, ptr, headersize);
+  /* Curl_convert_to_network calls failf if unsuccessful */
+  if(res) {
+    /* conversion failed, free memory and return to the caller */
+    if(in->buffer)
+      free(in->buffer);
+    free(in);
+    return res;
+  }
+
+  if(conn->handler->flags & PROTOPT_SSL) {
+    /* We never send more than CURL_MAX_WRITE_SIZE bytes in one single chunk
+       when we speak HTTPS, as if only a fraction of it is sent now, this data
+       needs to fit into the normal read-callback buffer later on and that
+       buffer is using this size.
+    */
+
+    sendsize= (size > CURL_MAX_WRITE_SIZE)?CURL_MAX_WRITE_SIZE:size;
+
+    /* OpenSSL is very picky and we must send the SAME buffer pointer to the
+       library when we attempt to re-send this buffer. Sending the same data
+       is not enough, we must use the exact same address. For this reason, we
+       must copy the data to the uploadbuffer first, since that is the buffer
+       we will be using if this send is retried later.
+    */
+    memcpy(conn->data->state.uploadbuffer, ptr, sendsize);
+    ptr = conn->data->state.uploadbuffer;
+  }
+  else
+    sendsize = size;
+
+  res = Curl_write(conn, sockfd, ptr, sendsize, &amount);
+
+  if(CURLE_OK == res) {
+    /*
+     * Note that we may not send the entire chunk at once, and we have a set
+     * number of data bytes at the end of the big buffer (out of which we may
+     * only send away a part).
+     */
+    /* how much of the header that was sent */
+    size_t headlen = (size_t)amount>headersize?headersize:(size_t)amount;
+    size_t bodylen = amount - headlen;
+
+    if(conn->data->set.verbose) {
+      /* this data _may_ contain binary stuff */
+      Curl_debug(conn->data, CURLINFO_HEADER_OUT, ptr, headlen, conn);
+      if(bodylen) {
+        /* there was body data sent beyond the initial header part, pass that
+           on to the debug callback too */
+        Curl_debug(conn->data, CURLINFO_DATA_OUT,
+                   ptr+headlen, bodylen, conn);
+      }
+    }
+    if(bodylen)
+      /* since we sent a piece of the body here, up the byte counter for it
+         accordingly */
+      http->writebytecount += bodylen;
+
+    /* 'amount' can never be a very large value here so typecasting it so a
+       signed 31 bit value should not cause problems even if ssize_t is
+       64bit */
+    *bytes_written += (long)amount;
+
+    if(http) {
+      if((size_t)amount != size) {
+        /* The whole request could not be sent in one system call. We must
+           queue it up and send it later when we get the chance. We must not
+           loop here and wait until it might work again. */
+
+        size -= amount;
+
+        ptr = in->buffer + amount;
+
+        /* backup the currently set pointers */
+        http->backup.fread_func = conn->fread_func;
+        http->backup.fread_in = conn->fread_in;
+        http->backup.postdata = http->postdata;
+        http->backup.postsize = http->postsize;
+
+        /* set the new pointers for the request-sending */
+        conn->fread_func = (curl_read_callback)readmoredata;
+        conn->fread_in = (void *)conn;
+        http->postdata = ptr;
+        http->postsize = (curl_off_t)size;
+
+        http->send_buffer = in;
+        http->sending = HTTPSEND_REQUEST;
+
+        return CURLE_OK;
+      }
+      http->sending = HTTPSEND_BODY;
+      /* the full buffer was sent, clean up and return */
+    }
+    else {
+      if((size_t)amount != size)
+        /* We have no continue-send mechanism now, fail. This can only happen
+           when this function is used from the CONNECT sending function. We
+           currently (stupidly) assume that the whole request is always sent
+           away in the first single chunk.
+
+           This needs FIXing.
+        */
+        return CURLE_SEND_ERROR;
+      else
+        conn->writechannel_inuse = FALSE;
+    }
+  }
+  if(in->buffer)
+    free(in->buffer);
+  free(in);
+
+  return res;
+}
+
+
+/*
+ * add_bufferf() add the formatted input to the buffer.
+ */
+CURLcode Curl_add_bufferf(Curl_send_buffer *in, const char *fmt, ...)
+{
+  char *s;
+  va_list ap;
+  va_start(ap, fmt);
+  s = vaprintf(fmt, ap); /* this allocs a new string to append */
+  va_end(ap);
+
+  if(s) {
+    CURLcode result = Curl_add_buffer(in, s, strlen(s));
+    free(s);
+    return result;
+  }
+  /* If we failed, we cleanup the whole buffer and return error */
+  if(in->buffer)
+    free(in->buffer);
+  free(in);
+  return CURLE_OUT_OF_MEMORY;
+}
+
+/*
+ * add_buffer() appends a memory chunk to the existing buffer
+ */
+CURLcode Curl_add_buffer(Curl_send_buffer *in, const void *inptr, size_t size)
+{
+  char *new_rb;
+  size_t new_size;
+
+  if(~size < in->size_used) {
+    /* If resulting used size of send buffer would wrap size_t, cleanup
+       the whole buffer and return error. Otherwise the required buffer
+       size will fit into a single allocatable memory chunk */
+    Curl_safefree(in->buffer);
+    free(in);
+    return CURLE_OUT_OF_MEMORY;
+  }
+
+  if(!in->buffer ||
+     ((in->size_used + size) > (in->size_max - 1))) {
+
+    /* If current buffer size isn't enough to hold the result, use a
+       buffer size that doubles the required size. If this new size
+       would wrap size_t, then just use the largest possible one */
+
+    if((size > (size_t)-1/2) || (in->size_used > (size_t)-1/2) ||
+       (~(size*2) < (in->size_used*2)))
+      new_size = (size_t)-1;
+    else
+      new_size = (in->size_used+size)*2;
+
+    if(in->buffer)
+      /* we have a buffer, enlarge the existing one */
+      new_rb = realloc(in->buffer, new_size);
+    else
+      /* create a new buffer */
+      new_rb = malloc(new_size);
+
+    if(!new_rb) {
+      /* If we failed, we cleanup the whole buffer and return error */
+      Curl_safefree(in->buffer);
+      free(in);
+      return CURLE_OUT_OF_MEMORY;
+    }
+
+    in->buffer = new_rb;
+    in->size_max = new_size;
+  }
+  memcpy(&in->buffer[in->size_used], inptr, size);
+
+  in->size_used += size;
+
+  return CURLE_OK;
+}
+
+/* end of the add_buffer functions */
+/* ------------------------------------------------------------------------- */
+
+
+
+/*
+ * Curl_compareheader()
+ *
+ * Returns TRUE if 'headerline' contains the 'header' with given 'content'.
+ * Pass headers WITH the colon.
+ */
+bool
+Curl_compareheader(const char *headerline, /* line to check */
+                   const char *header,  /* header keyword _with_ colon */
+                   const char *content) /* content string to find */
+{
+  /* RFC2616, section 4.2 says: "Each header field consists of a name followed
+   * by a colon (":") and the field value. Field names are case-insensitive.
+   * The field value MAY be preceded by any amount of LWS, though a single SP
+   * is preferred." */
+
+  size_t hlen = strlen(header);
+  size_t clen;
+  size_t len;
+  const char *start;
+  const char *end;
+
+  if(!Curl_raw_nequal(headerline, header, hlen))
+    return FALSE; /* doesn't start with header */
+
+  /* pass the header */
+  start = &headerline[hlen];
+
+  /* pass all white spaces */
+  while(*start && ISSPACE(*start))
+    start++;
+
+  /* find the end of the header line */
+  end = strchr(start, '\r'); /* lines end with CRLF */
+  if(!end) {
+    /* in case there's a non-standard compliant line here */
+    end = strchr(start, '\n');
+
+    if(!end)
+      /* hm, there's no line ending here, use the zero byte! */
+      end = strchr(start, '\0');
+  }
+
+  len = end-start; /* length of the content part of the input line */
+  clen = strlen(content); /* length of the word to find */
+
+  /* find the content string in the rest of the line */
+  for(;len>=clen;len--, start++) {
+    if(Curl_raw_nequal(start, content, clen))
+      return TRUE; /* match! */
+  }
+
+  return FALSE; /* no match */
+}
+
+/*
+ * Curl_http_connect() performs HTTP stuff to do at connect-time, called from
+ * the generic Curl_connect().
+ */
+CURLcode Curl_http_connect(struct connectdata *conn, bool *done)
+{
+  CURLcode result;
+
+  /* We default to persistent connections. We set this already in this connect
+     function to make the re-use checks properly be able to check this bit. */
+  conn->bits.close = FALSE;
+
+  /* the CONNECT procedure might not have been completed */
+  result = Curl_proxy_connect(conn);
+  if(result)
+    return result;
+
+  if(conn->tunnel_state[FIRSTSOCKET] == TUNNEL_CONNECT)
+    /* nothing else to do except wait right now - we're not done here. */
+    return CURLE_OK;
+
+  if(conn->given->flags & PROTOPT_SSL) {
+    /* perform SSL initialization */
+    result = https_connecting(conn, done);
+    if(result)
+      return result;
+  }
+  else
+    *done = TRUE;
+
+  return CURLE_OK;
+}
+
+/* this returns the socket to wait for in the DO and DOING state for the multi
+   interface and then we're always _sending_ a request and thus we wait for
+   the single socket to become writable only */
+static int http_getsock_do(struct connectdata *conn,
+                           curl_socket_t *socks,
+                           int numsocks)
+{
+  /* write mode */
+  (void)numsocks; /* unused, we trust it to be at least 1 */
+  socks[0] = conn->sock[FIRSTSOCKET];
+  return GETSOCK_WRITESOCK(0);
+}
+
+#ifdef USE_SSL
+static CURLcode https_connecting(struct connectdata *conn, bool *done)
+{
+  CURLcode result;
+  DEBUGASSERT((conn) && (conn->handler->flags & PROTOPT_SSL));
+
+  /* perform SSL initialization for this socket */
+  result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, done);
+  if(result)
+    conn->bits.close = TRUE; /* a failed connection is marked for closure
+                                to prevent (bad) re-use or similar */
+  return result;
+}
+#endif
+
+#if defined(USE_SSLEAY) || defined(USE_GNUTLS) || defined(USE_SCHANNEL) || \
+    defined(USE_DARWINSSL)
+/* This function is for OpenSSL, GnuTLS, darwinssl, and schannel only.
+   It should be made to query the generic SSL layer instead. */
+static int https_getsock(struct connectdata *conn,
+                         curl_socket_t *socks,
+                         int numsocks)
+{
+  if(conn->handler->flags & PROTOPT_SSL) {
+    struct ssl_connect_data *connssl = &conn->ssl[FIRSTSOCKET];
+
+    if(!numsocks)
+      return GETSOCK_BLANK;
+
+    if(connssl->connecting_state == ssl_connect_2_writing) {
+      /* write mode */
+      socks[0] = conn->sock[FIRSTSOCKET];
+      return GETSOCK_WRITESOCK(0);
+    }
+    else if(connssl->connecting_state == ssl_connect_2_reading) {
+      /* read mode */
+      socks[0] = conn->sock[FIRSTSOCKET];
+      return GETSOCK_READSOCK(0);
+    }
+  }
+  return CURLE_OK;
+}
+#else
+#ifdef USE_SSL
+static int https_getsock(struct connectdata *conn,
+                         curl_socket_t *socks,
+                         int numsocks)
+{
+  (void)conn;
+  (void)socks;
+  (void)numsocks;
+  return GETSOCK_BLANK;
+}
+#endif /* USE_SSL */
+#endif /* USE_SSLEAY || USE_GNUTLS || USE_SCHANNEL */
+
+/*
+ * Curl_http_done() gets called from Curl_done() after a single HTTP request
+ * has been performed.
+ */
+
+CURLcode Curl_http_done(struct connectdata *conn,
+                        CURLcode status, bool premature)
+{
+  struct SessionHandle *data = conn->data;
+  struct HTTP *http =data->state.proto.http;
+
+  Curl_unencode_cleanup(conn);
+
+  /* set the proper values (possibly modified on POST) */
+  conn->fread_func = data->set.fread_func; /* restore */
+  conn->fread_in = data->set.in; /* restore */
+  conn->seek_func = data->set.seek_func; /* restore */
+  conn->seek_client = data->set.seek_client; /* restore */
+
+  if(http == NULL)
+    return CURLE_OK;
+
+  if(http->send_buffer) {
+    Curl_send_buffer *buff = http->send_buffer;
+
+    free(buff->buffer);
+    free(buff);
+    http->send_buffer = NULL; /* clear the pointer */
+  }
+
+  if(HTTPREQ_POST_FORM == data->set.httpreq) {
+    data->req.bytecount = http->readbytecount + http->writebytecount;
+
+    Curl_formclean(&http->sendit); /* Now free that whole lot */
+    if(http->form.fp) {
+      /* a file being uploaded was left opened, close it! */
+      fclose(http->form.fp);
+      http->form.fp = NULL;
+    }
+  }
+  else if(HTTPREQ_PUT == data->set.httpreq)
+    data->req.bytecount = http->readbytecount + http->writebytecount;
+
+  if(status != CURLE_OK)
+    return (status);
+
+  if(!premature && /* this check is pointless when DONE is called before the
+                      entire operation is complete */
+     !conn->bits.retry &&
+     ((http->readbytecount +
+       data->req.headerbytecount -
+       data->req.deductheadercount)) <= 0) {
+    /* If this connection isn't simply closed to be retried, AND nothing was
+       read from the HTTP server (that counts), this can't be right so we
+       return an error here */
+    failf(data, "Empty reply from server");
+    return CURLE_GOT_NOTHING;
+  }
+
+  return CURLE_OK;
+}
+
+
+/* Determine if we should use HTTP 1.1 for this request. Reasons to avoid it
+   are if the user specifically requested HTTP 1.0, if the server we are
+   connected to only supports 1.0, or if any server previously contacted to
+   handle this request only supports 1.0. */
+static bool use_http_1_1(const struct SessionHandle *data,
+                         const struct connectdata *conn)
+{
+  return ((data->set.httpversion == CURL_HTTP_VERSION_1_1) ||
+         ((data->set.httpversion != CURL_HTTP_VERSION_1_0) &&
+          ((conn->httpversion == 11) ||
+           ((conn->httpversion != 10) &&
+            (data->state.httpversion != 10))))) ? TRUE : FALSE;
+}
+
+/* check and possibly add an Expect: header */
+static CURLcode expect100(struct SessionHandle *data,
+                          struct connectdata *conn,
+                          Curl_send_buffer *req_buffer)
+{
+  CURLcode result = CURLE_OK;
+  const char *ptr;
+  data->state.expect100header = FALSE; /* default to false unless it is set
+                                          to TRUE below */
+  if(use_http_1_1(data, conn)) {
+    /* if not doing HTTP 1.0 or disabled explicitly, we add a Expect:
+       100-continue to the headers which actually speeds up post operations
+       (as there is one packet coming back from the web server) */
+    ptr = Curl_checkheaders(data, "Expect:");
+    if(ptr) {
+      data->state.expect100header =
+        Curl_compareheader(ptr, "Expect:", "100-continue");
+    }
+    else {
+      result = Curl_add_bufferf(req_buffer,
+                         "Expect: 100-continue\r\n");
+      if(result == CURLE_OK)
+        data->state.expect100header = TRUE;
+    }
+  }
+  return result;
+}
+
+CURLcode Curl_add_custom_headers(struct connectdata *conn,
+                                   Curl_send_buffer *req_buffer)
+{
+  char *ptr;
+  struct curl_slist *headers=conn->data->set.headers;
+
+  while(headers) {
+    ptr = strchr(headers->data, ':');
+    if(ptr) {
+      /* we require a colon for this to be a true header */
+
+      ptr++; /* pass the colon */
+      while(*ptr && ISSPACE(*ptr))
+        ptr++;
+
+      if(*ptr) {
+        /* only send this if the contents was non-blank */
+
+        if(conn->allocptr.host &&
+           /* a Host: header was sent already, don't pass on any custom Host:
+              header as that will produce *two* in the same request! */
+           checkprefix("Host:", headers->data))
+          ;
+        else if(conn->data->set.httpreq == HTTPREQ_POST_FORM &&
+                /* this header (extended by formdata.c) is sent later */
+                checkprefix("Content-Type:", headers->data))
+          ;
+        else if(conn->bits.authneg &&
+                /* while doing auth neg, don't allow the custom length since
+                   we will force length zero then */
+                checkprefix("Content-Length", headers->data))
+          ;
+        else if(conn->allocptr.te &&
+                /* when asking for Transfer-Encoding, don't pass on a custom
+                   Connection: */
+                checkprefix("Connection", headers->data))
+          ;
+        else {
+          CURLcode result = Curl_add_bufferf(req_buffer, "%s\r\n",
+                                             headers->data);
+          if(result)
+            return result;
+        }
+      }
+    }
+    else {
+      ptr = strchr(headers->data, ';');
+      if(ptr) {
+
+        ptr++; /* pass the semicolon */
+        while(*ptr && ISSPACE(*ptr))
+          ptr++;
+
+        if(*ptr) {
+          /* this may be used for something else in the future */
+        }
+        else {
+          if(*(--ptr) == ';') {
+            CURLcode result;
+
+            /* send no-value custom header if terminated by semicolon */
+            *ptr = ':';
+            result = Curl_add_bufferf(req_buffer, "%s\r\n",
+                                             headers->data);
+            if(result)
+              return result;
+          }
+        }
+      }
+    }
+    headers = headers->next;
+  }
+  return CURLE_OK;
+}
+
+CURLcode Curl_add_timecondition(struct SessionHandle *data,
+                                Curl_send_buffer *req_buffer)
+{
+  const struct tm *tm;
+  char *buf = data->state.buffer;
+  CURLcode result = CURLE_OK;
+  struct tm keeptime;
+
+  result = Curl_gmtime(data->set.timevalue, &keeptime);
+  if(result) {
+    failf(data, "Invalid TIMEVALUE");
+    return result;
+  }
+  tm = &keeptime;
+
+  /* The If-Modified-Since header family should have their times set in
+   * GMT as RFC2616 defines: "All HTTP date/time stamps MUST be
+   * represented in Greenwich Mean Time (GMT), without exception. For the
+   * purposes of HTTP, GMT is exactly equal to UTC (Coordinated Universal
+   * Time)." (see page 20 of RFC2616).
+   */
+
+  /* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
+  snprintf(buf, BUFSIZE-1,
+           "%s, %02d %s %4d %02d:%02d:%02d GMT",
+           Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
+           tm->tm_mday,
+           Curl_month[tm->tm_mon],
+           tm->tm_year + 1900,
+           tm->tm_hour,
+           tm->tm_min,
+           tm->tm_sec);
+
+  switch(data->set.timecondition) {
+  case CURL_TIMECOND_IFMODSINCE:
+  default:
+    result = Curl_add_bufferf(req_buffer,
+                              "If-Modified-Since: %s\r\n", buf);
+    break;
+  case CURL_TIMECOND_IFUNMODSINCE:
+    result = Curl_add_bufferf(req_buffer,
+                              "If-Unmodified-Since: %s\r\n", buf);
+    break;
+  case CURL_TIMECOND_LASTMOD:
+    result = Curl_add_bufferf(req_buffer,
+                              "Last-Modified: %s\r\n", buf);
+    break;
+  }
+
+  return result;
+}
+
+/*
+ * Curl_http() gets called from the generic Curl_do() function when a HTTP
+ * request is to be performed. This creates and sends a properly constructed
+ * HTTP request.
+ */
+CURLcode Curl_http(struct connectdata *conn, bool *done)
+{
+  struct SessionHandle *data=conn->data;
+  CURLcode result=CURLE_OK;
+  struct HTTP *http;
+  const char *ppath = data->state.path;
+  bool paste_ftp_userpwd = FALSE;
+  char ftp_typecode[sizeof("/;type=?")] = "";
+  const char *host = conn->host.name;
+  const char *te = ""; /* transfer-encoding */
+  const char *ptr;
+  const char *request;
+  Curl_HttpReq httpreq = data->set.httpreq;
+  char *addcookies = NULL;
+  curl_off_t included_body = 0;
+  const char *httpstring;
+  Curl_send_buffer *req_buffer;
+  curl_off_t postsize = 0; /* curl_off_t to handle large file sizes */
+  int seekerr = CURL_SEEKFUNC_OK;
+
+  /* Always consider the DO phase done after this function call, even if there
+     may be parts of the request that is not yet sent, since we can deal with
+     the rest of the request in the PERFORM phase. */
+  *done = TRUE;
+
+  /* If there already is a protocol-specific struct allocated for this
+     sessionhandle, deal with it */
+  Curl_reset_reqproto(conn);
+
+  if(!data->state.proto.http) {
+    /* Only allocate this struct if we don't already have it! */
+
+    http = calloc(1, sizeof(struct HTTP));
+    if(!http)
+      return CURLE_OUT_OF_MEMORY;
+    data->state.proto.http = http;
+  }
+  else
+    http = data->state.proto.http;
+
+  if(!data->state.this_is_a_follow) {
+    /* this is not a followed location, get the original host name */
+    if(data->state.first_host)
+      /* Free to avoid leaking memory on multiple requests*/
+      free(data->state.first_host);
+
+    data->state.first_host = strdup(conn->host.name);
+    if(!data->state.first_host)
+      return CURLE_OUT_OF_MEMORY;
+  }
+  http->writebytecount = http->readbytecount = 0;
+
+  if((conn->handler->protocol&(CURLPROTO_HTTP|CURLPROTO_FTP)) &&
+     data->set.upload) {
+    httpreq = HTTPREQ_PUT;
+  }
+
+  /* Now set the 'request' pointer to the proper request string */
+  if(data->set.str[STRING_CUSTOMREQUEST])
+    request = data->set.str[STRING_CUSTOMREQUEST];
+  else {
+    if(data->set.opt_no_body)
+      request = "HEAD";
+    else {
+      DEBUGASSERT((httpreq > HTTPREQ_NONE) && (httpreq < HTTPREQ_LAST));
+      switch(httpreq) {
+      case HTTPREQ_POST:
+      case HTTPREQ_POST_FORM:
+        request = "POST";
+        break;
+      case HTTPREQ_PUT:
+        request = "PUT";
+        break;
+      default: /* this should never happen */
+      case HTTPREQ_GET:
+        request = "GET";
+        break;
+      case HTTPREQ_HEAD:
+        request = "HEAD";
+        break;
+      }
+    }
+  }
+
+  /* The User-Agent string might have been allocated in url.c already, because
+     it might have been used in the proxy connect, but if we have got a header
+     with the user-agent string specified, we erase the previously made string
+     here. */
+  if(Curl_checkheaders(data, "User-Agent:") && conn->allocptr.uagent) {
+    free(conn->allocptr.uagent);
+    conn->allocptr.uagent=NULL;
+  }
+
+  /* setup the authentication headers */
+  result = Curl_http_output_auth(conn, request, ppath, FALSE);
+  if(result)
+    return result;
+
+  if((data->state.authhost.multi || data->state.authproxy.multi) &&
+     (httpreq != HTTPREQ_GET) &&
+     (httpreq != HTTPREQ_HEAD)) {
+    /* Auth is required and we are not authenticated yet. Make a PUT or POST
+       with content-length zero as a "probe". */
+    conn->bits.authneg = TRUE;
+  }
+  else
+    conn->bits.authneg = FALSE;
+
+  Curl_safefree(conn->allocptr.ref);
+  if(data->change.referer && !Curl_checkheaders(data, "Referer:"))
+    conn->allocptr.ref = aprintf("Referer: %s\r\n", data->change.referer);
+  else
+    conn->allocptr.ref = NULL;
+
+  if(data->set.str[STRING_COOKIE] && !Curl_checkheaders(data, "Cookie:"))
+    addcookies = data->set.str[STRING_COOKIE];
+
+  if(!Curl_checkheaders(data, "Accept-Encoding:") &&
+     data->set.str[STRING_ENCODING]) {
+    Curl_safefree(conn->allocptr.accept_encoding);
+    conn->allocptr.accept_encoding =
+      aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
+    if(!conn->allocptr.accept_encoding)
+      return CURLE_OUT_OF_MEMORY;
+  }
+
+#ifdef HAVE_LIBZ
+  /* we only consider transfer-encoding magic if libz support is built-in */
+
+  if(!Curl_checkheaders(data, "TE:") && data->set.http_transfer_encoding) {
+    /* When we are to insert a TE: header in the request, we must also insert
+       TE in a Connection: header, so we need to merge the custom provided
+       Connection: header and prevent the original to get sent. Note that if
+       the user has inserted his/hers own TE: header we don't do this magic
+       but then assume that the user will handle it all! */
+    char *cptr = Curl_checkheaders(data, "Connection:");
+#define TE_HEADER "TE: gzip\r\n"
+
+    Curl_safefree(conn->allocptr.te);
+
+    /* Create the (updated) Connection: header */
+    conn->allocptr.te = cptr? aprintf("%s, TE\r\n" TE_HEADER, cptr):
+      strdup("Connection: TE\r\n" TE_HEADER);
+
+    if(!conn->allocptr.te)
+      return CURLE_OUT_OF_MEMORY;
+  }
+#endif
+
+  ptr = Curl_checkheaders(data, "Transfer-Encoding:");
+  if(ptr) {
+    /* Some kind of TE is requested, check if 'chunked' is chosen */
+    data->req.upload_chunky =
+      Curl_compareheader(ptr, "Transfer-Encoding:", "chunked");
+  }
+  else {
+    if((conn->handler->protocol&CURLPROTO_HTTP) &&
+       data->set.upload &&
+       (data->set.infilesize == -1)) {
+      if(conn->bits.authneg)
+        /* don't enable chunked during auth neg */
+        ;
+      else if(use_http_1_1(data, conn)) {
+        /* HTTP, upload, unknown file size and not HTTP 1.0 */
+        data->req.upload_chunky = TRUE;
+      }
+      else {
+        failf(data, "Chunky upload is not supported by HTTP 1.0");
+        return CURLE_UPLOAD_FAILED;
+      }
+    }
+    else {
+      /* else, no chunky upload */
+      data->req.upload_chunky = FALSE;
+    }
+
+    if(data->req.upload_chunky)
+      te = "Transfer-Encoding: chunked\r\n";
+  }
+
+  Curl_safefree(conn->allocptr.host);
+
+  ptr = Curl_checkheaders(data, "Host:");
+  if(ptr && (!data->state.this_is_a_follow ||
+             Curl_raw_equal(data->state.first_host, conn->host.name))) {
+#if !defined(CURL_DISABLE_COOKIES)
+    /* If we have a given custom Host: header, we extract the host name in
+       order to possibly use it for cookie reasons later on. We only allow the
+       custom Host: header if this is NOT a redirect, as setting Host: in the
+       redirected request is being out on thin ice. Except if the host name
+       is the same as the first one! */
+    char *cookiehost = copy_header_value(ptr);
+    if(!cookiehost)
+      return CURLE_OUT_OF_MEMORY;
+    if(!*cookiehost)
+      /* ignore empty data */
+      free(cookiehost);
+    else {
+      /* If the host begins with '[', we start searching for the port after
+         the bracket has been closed */
+      int startsearch = 0;
+      if(*cookiehost == '[') {
+        char *closingbracket;
+        /* since the 'cookiehost' is an allocated memory area that will be
+           freed later we cannot simply increment the pointer */
+        memmove(cookiehost, cookiehost + 1, strlen(cookiehost) - 1);
+        closingbracket = strchr(cookiehost, ']');
+        if(closingbracket)
+          *closingbracket = 0;
+      }
+      else {
+        char *colon = strchr(cookiehost + startsearch, ':');
+        if(colon)
+          *colon = 0; /* The host must not include an embedded port number */
+      }
+      Curl_safefree(conn->allocptr.cookiehost);
+      conn->allocptr.cookiehost = cookiehost;
+    }
+#endif
+
+    conn->allocptr.host = NULL;
+  }
+  else {
+    /* When building Host: headers, we must put the host name within
+       [brackets] if the host name is a plain IPv6-address. RFC2732-style. */
+
+    if(((conn->given->protocol&CURLPROTO_HTTPS) &&
+        (conn->remote_port == PORT_HTTPS)) ||
+       ((conn->given->protocol&CURLPROTO_HTTP) &&
+        (conn->remote_port == PORT_HTTP)) )
+      /* if(HTTPS on port 443) OR (HTTP on port 80) then don't include
+         the port number in the host string */
+      conn->allocptr.host = aprintf("Host: %s%s%s\r\n",
+                                    conn->bits.ipv6_ip?"[":"",
+                                    host,
+                                    conn->bits.ipv6_ip?"]":"");
+    else
+      conn->allocptr.host = aprintf("Host: %s%s%s:%hu\r\n",
+                                    conn->bits.ipv6_ip?"[":"",
+                                    host,
+                                    conn->bits.ipv6_ip?"]":"",
+                                    conn->remote_port);
+
+    if(!conn->allocptr.host)
+      /* without Host: we can't make a nice request */
+      return CURLE_OUT_OF_MEMORY;
+  }
+
+#ifndef CURL_DISABLE_PROXY
+  if(conn->bits.httpproxy && !conn->bits.tunnel_proxy)  {
+    /* Using a proxy but does not tunnel through it */
+
+    /* The path sent to the proxy is in fact the entire URL. But if the remote
+       host is a IDN-name, we must make sure that the request we produce only
+       uses the encoded host name! */
+    if(conn->host.dispname != conn->host.name) {
+      char *url = data->change.url;
+      ptr = strstr(url, conn->host.dispname);
+      if(ptr) {
+        /* This is where the display name starts in the URL, now replace this
+           part with the encoded name. TODO: This method of replacing the host
+           name is rather crude as I believe there's a slight risk that the
+           user has entered a user name or password that contain the host name
+           string. */
+        size_t currlen = strlen(conn->host.dispname);
+        size_t newlen = strlen(conn->host.name);
+        size_t urllen = strlen(url);
+
+        char *newurl;
+
+        newurl = malloc(urllen + newlen - currlen + 1);
+        if(newurl) {
+          /* copy the part before the host name */
+          memcpy(newurl, url, ptr - url);
+          /* append the new host name instead of the old */
+          memcpy(newurl + (ptr - url), conn->host.name, newlen);
+          /* append the piece after the host name */
+          memcpy(newurl + newlen + (ptr - url),
+                 ptr + currlen, /* copy the trailing zero byte too */
+                 urllen - (ptr-url) - currlen + 1);
+          if(data->change.url_alloc) {
+            Curl_safefree(data->change.url);
+            data->change.url_alloc = FALSE;
+          }
+          data->change.url = newurl;
+          data->change.url_alloc = TRUE;
+        }
+        else
+          return CURLE_OUT_OF_MEMORY;
+      }
+    }
+    ppath = data->change.url;
+    if(checkprefix("ftp://", ppath)) {
+      if(data->set.proxy_transfer_mode) {
+        /* when doing ftp, append ;type=<a|i> if not present */
+        char *type = strstr(ppath, ";type=");
+        if(type && type[6] && type[7] == 0) {
+          switch (Curl_raw_toupper(type[6])) {
+          case 'A':
+          case 'D':
+          case 'I':
+            break;
+          default:
+            type = NULL;
+          }
+        }
+        if(!type) {
+          char *p = ftp_typecode;
+          /* avoid sending invalid URLs like ftp://example.com;type=i if the
+           * user specified ftp://example.com without the slash */
+          if(!*data->state.path && ppath[strlen(ppath) - 1] != '/') {
+            *p++ = '/';
+          }
+          snprintf(p, sizeof(ftp_typecode) - 1, ";type=%c",
+                   data->set.prefer_ascii ? 'a' : 'i');
+        }
+      }
+      if(conn->bits.user_passwd && !conn->bits.userpwd_in_url)
+        paste_ftp_userpwd = TRUE;
+    }
+  }
+#endif /* CURL_DISABLE_PROXY */
+
+  if(HTTPREQ_POST_FORM == httpreq) {
+    /* we must build the whole post sequence first, so that we have a size of
+       the whole transfer before we start to send it */
+    result = Curl_getformdata(data, &http->sendit, data->set.httppost,
+                              Curl_checkheaders(data, "Content-Type:"),
+                              &http->postsize);
+    if(result)
+      return result;
+  }
+
+  http->p_accept = Curl_checkheaders(data, "Accept:")?NULL:"Accept: */*\r\n";
+
+  if(( (HTTPREQ_POST == httpreq) ||
+       (HTTPREQ_POST_FORM == httpreq) ||
+       (HTTPREQ_PUT == httpreq) ) &&
+     data->state.resume_from) {
+    /**********************************************************************
+     * Resuming upload in HTTP means that we PUT or POST and that we have
+     * got a resume_from value set. The resume value has already created
+     * a Range: header that will be passed along. We need to "fast forward"
+     * the file the given number of bytes and decrease the assume upload
+     * file size before we continue this venture in the dark lands of HTTP.
+     *********************************************************************/
+
+    if(data->state.resume_from < 0 ) {
+      /*
+       * This is meant to get the size of the present remote-file by itself.
+       * We don't support this now. Bail out!
+       */
+      data->state.resume_from = 0;
+    }
+
+    if(data->state.resume_from && !data->state.this_is_a_follow) {
+      /* do we still game? */
+
+      /* Now, let's read off the proper amount of bytes from the
+         input. */
+      if(conn->seek_func) {
+        seekerr = conn->seek_func(conn->seek_client, data->state.resume_from,
+                                  SEEK_SET);
+      }
+
+      if(seekerr != CURL_SEEKFUNC_OK) {
+        if(seekerr != CURL_SEEKFUNC_CANTSEEK) {
+          failf(data, "Could not seek stream");
+          return CURLE_READ_ERROR;
+        }
+        /* when seekerr == CURL_SEEKFUNC_CANTSEEK (can't seek to offset) */
+        else {
+          curl_off_t passed=0;
+          do {
+            size_t readthisamountnow =
+              (data->state.resume_from - passed > CURL_OFF_T_C(BUFSIZE)) ?
+              BUFSIZE : curlx_sotouz(data->state.resume_from - passed);
+
+            size_t actuallyread =
+              data->set.fread_func(data->state.buffer, 1, readthisamountnow,
+                                   data->set.in);
+
+            passed += actuallyread;
+            if((actuallyread == 0) || (actuallyread > readthisamountnow)) {
+              /* this checks for greater-than only to make sure that the
+                 CURL_READFUNC_ABORT return code still aborts */
+              failf(data, "Could only read %" FORMAT_OFF_T
+                    " bytes from the input",
+                    passed);
+              return CURLE_READ_ERROR;
+            }
+          } while(passed < data->state.resume_from);
+        }
+      }
+
+      /* now, decrease the size of the read */
+      if(data->set.infilesize>0) {
+        data->set.infilesize -= data->state.resume_from;
+
+        if(data->set.infilesize <= 0) {
+          failf(data, "File already completely uploaded");
+          return CURLE_PARTIAL_FILE;
+        }
+      }
+      /* we've passed, proceed as normal */
+    }
+  }
+  if(data->state.use_range) {
+    /*
+     * A range is selected. We use different headers whether we're downloading
+     * or uploading and we always let customized headers override our internal
+     * ones if any such are specified.
+     */
+    if(((httpreq == HTTPREQ_GET) || (httpreq == HTTPREQ_HEAD)) &&
+       !Curl_checkheaders(data, "Range:")) {
+      /* if a line like this was already allocated, free the previous one */
+      if(conn->allocptr.rangeline)
+        free(conn->allocptr.rangeline);
+      conn->allocptr.rangeline = aprintf("Range: bytes=%s\r\n",
+                                         data->state.range);
+    }
+    else if((httpreq != HTTPREQ_GET) &&
+            !Curl_checkheaders(data, "Content-Range:")) {
+
+      /* if a line like this was already allocated, free the previous one */
+      if(conn->allocptr.rangeline)
+        free(conn->allocptr.rangeline);
+
+      if(data->set.set_resume_from < 0) {
+        /* Upload resume was asked for, but we don't know the size of the
+           remote part so we tell the server (and act accordingly) that we
+           upload the whole file (again) */
+        conn->allocptr.rangeline =
+          aprintf("Content-Range: bytes 0-%" FORMAT_OFF_T
+                  "/%" FORMAT_OFF_T "\r\n",
+                  data->set.infilesize - 1, data->set.infilesize);
+
+      }
+      else if(data->state.resume_from) {
+        /* This is because "resume" was selected */
+        curl_off_t total_expected_size=
+          data->state.resume_from + data->set.infilesize;
+        conn->allocptr.rangeline =
+          aprintf("Content-Range: bytes %s%" FORMAT_OFF_T
+                  "/%" FORMAT_OFF_T "\r\n",
+                  data->state.range, total_expected_size-1,
+                  total_expected_size);
+      }
+      else {
+        /* Range was selected and then we just pass the incoming range and
+           append total size */
+        conn->allocptr.rangeline =
+          aprintf("Content-Range: bytes %s/%" FORMAT_OFF_T "\r\n",
+                  data->state.range, data->set.infilesize);
+      }
+      if(!conn->allocptr.rangeline)
+        return CURLE_OUT_OF_MEMORY;
+    }
+  }
+
+  /* Use 1.1 unless the user specifically asked for 1.0 or the server only
+     supports 1.0 */
+  httpstring= use_http_1_1(data, conn)?"1.1":"1.0";
+
+  /* initialize a dynamic send-buffer */
+  req_buffer = Curl_add_buffer_init();
+
+  if(!req_buffer)
+    return CURLE_OUT_OF_MEMORY;
+
+  /* add the main request stuff */
+  /* GET/HEAD/POST/PUT */
+  result = Curl_add_bufferf(req_buffer, "%s ", request);
+  if(result)
+    return result;
+
+  /* url */
+  if(paste_ftp_userpwd)
+    result = Curl_add_bufferf(req_buffer, "ftp://%s:%s@%s",
+                              conn->user, conn->passwd,
+                              ppath + sizeof("ftp://") - 1);
+  else
+    result = Curl_add_buffer(req_buffer, ppath, strlen(ppath));
+  if(result)
+    return result;
+
+  result =
+    Curl_add_bufferf(req_buffer,
+                     "%s" /* ftp typecode (;type=x) */
+                     " HTTP/%s\r\n" /* HTTP version */
+                     "%s" /* proxyuserpwd */
+                     "%s" /* userpwd */
+                     "%s" /* range */
+                     "%s" /* user agent */
+                     "%s" /* host */
+                     "%s" /* accept */
+                     "%s" /* TE: */
+                     "%s" /* accept-encoding */
+                     "%s" /* referer */
+                     "%s" /* Proxy-Connection */
+                     "%s",/* transfer-encoding */
+
+                     ftp_typecode,
+                     httpstring,
+                     conn->allocptr.proxyuserpwd?
+                     conn->allocptr.proxyuserpwd:"",
+                     conn->allocptr.userpwd?conn->allocptr.userpwd:"",
+                     (data->state.use_range && conn->allocptr.rangeline)?
+                     conn->allocptr.rangeline:"",
+                     (data->set.str[STRING_USERAGENT] &&
+                      *data->set.str[STRING_USERAGENT] &&
+                      conn->allocptr.uagent)?
+                     conn->allocptr.uagent:"",
+                     (conn->allocptr.host?conn->allocptr.host:""),
+                     http->p_accept?http->p_accept:"",
+                     conn->allocptr.te?conn->allocptr.te:"",
+                     (data->set.str[STRING_ENCODING] &&
+                      *data->set.str[STRING_ENCODING] &&
+                      conn->allocptr.accept_encoding)?
+                     conn->allocptr.accept_encoding:"",
+                     (data->change.referer && conn->allocptr.ref)?
+                     conn->allocptr.ref:"" /* Referer: <data> */,
+                     (conn->bits.httpproxy &&
+                      !conn->bits.tunnel_proxy &&
+                      !Curl_checkheaders(data, "Proxy-Connection:"))?
+                     "Proxy-Connection: Keep-Alive\r\n":"",
+                     te
+      );
+
+  /*
+   * Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
+   * with basic and digest, it will be freed anyway by the next request
+   */
+
+  Curl_safefree (conn->allocptr.userpwd);
+  conn->allocptr.userpwd = NULL;
+
+  if(result)
+    return result;
+
+#if !defined(CURL_DISABLE_COOKIES)
+  if(data->cookies || addcookies) {
+    struct Cookie *co=NULL; /* no cookies from start */
+    int count=0;
+
+    if(data->cookies) {
+      Curl_share_lock(data, CURL_LOCK_DATA_COOKIE, CURL_LOCK_ACCESS_SINGLE);
+      co = Curl_cookie_getlist(data->cookies,
+                               conn->allocptr.cookiehost?
+                               conn->allocptr.cookiehost:host,
+                               data->state.path,
+                               (conn->handler->protocol&CURLPROTO_HTTPS)?
+                               TRUE:FALSE);
+      Curl_share_unlock(data, CURL_LOCK_DATA_COOKIE);
+    }
+    if(co) {
+      struct Cookie *store=co;
+      /* now loop through all cookies that matched */
+      while(co) {
+        if(co->value) {
+          if(0 == count) {
+            result = Curl_add_bufferf(req_buffer, "Cookie: ");
+            if(result)
+              break;
+          }
+          result = Curl_add_bufferf(req_buffer,
+                                    "%s%s=%s", count?"; ":"",
+                                    co->name, co->value);
+          if(result)
+            break;
+          count++;
+        }
+        co = co->next; /* next cookie please */
+      }
+      Curl_cookie_freelist(store, FALSE); /* free the cookie list */
+    }
+    if(addcookies && (CURLE_OK == result)) {
+      if(!count)
+        result = Curl_add_bufferf(req_buffer, "Cookie: ");
+      if(CURLE_OK == result) {
+        result = Curl_add_bufferf(req_buffer, "%s%s",
+                                  count?"; ":"",
+                                  addcookies);
+        count++;
+      }
+    }
+    if(count && (CURLE_OK == result))
+      result = Curl_add_buffer(req_buffer, "\r\n", 2);
+
+    if(result)
+      return result;
+  }
+#endif
+
+  if(data->set.timecondition) {
+    result = Curl_add_timecondition(data, req_buffer);
+    if(result)
+      return result;
+  }
+
+  result = Curl_add_custom_headers(conn, req_buffer);
+  if(result)
+    return result;
+
+  http->postdata = NULL;  /* nothing to post at this point */
+  Curl_pgrsSetUploadSize(data, 0); /* upload size is 0 atm */
+
+  /* If 'authdone' is FALSE, we must not set the write socket index to the
+     Curl_transfer() call below, as we're not ready to actually upload any
+     data yet. */
+
+  switch(httpreq) {
+
+  case HTTPREQ_POST_FORM:
+    if(!http->sendit || conn->bits.authneg) {
+      /* nothing to post! */
+      result = Curl_add_bufferf(req_buffer, "Content-Length: 0\r\n\r\n");
+      if(result)
+        return result;
+
+      result = Curl_add_buffer_send(req_buffer, conn,
+                                    &data->info.request_size, 0, FIRSTSOCKET);
+      if(result)
+        failf(data, "Failed sending POST request");
+      else
+        /* setup variables for the upcoming transfer */
+        Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE, &http->readbytecount,
+                            -1, NULL);
+      break;
+    }
+
+    if(Curl_FormInit(&http->form, http->sendit)) {
+      failf(data, "Internal HTTP POST error!");
+      return CURLE_HTTP_POST_ERROR;
+    }
+
+    /* Get the currently set callback function pointer and store that in the
+       form struct since we might want the actual user-provided callback later
+       on. The conn->fread_func pointer itself will be changed for the
+       multipart case to the function that returns a multipart formatted
+       stream. */
+    http->form.fread_func = conn->fread_func;
+
+    /* Set the read function to read from the generated form data */
+    conn->fread_func = (curl_read_callback)Curl_FormReader;
+    conn->fread_in = &http->form;
+
+    http->sending = HTTPSEND_BODY;
+
+    if(!data->req.upload_chunky &&
+       !Curl_checkheaders(data, "Content-Length:")) {
+      /* only add Content-Length if not uploading chunked */
+      result = Curl_add_bufferf(req_buffer,
+                                "Content-Length: %" FORMAT_OFF_T "\r\n",
+                                http->postsize);
+      if(result)
+        return result;
+    }
+
+    result = expect100(data, conn, req_buffer);
+    if(result)
+      return result;
+
+    {
+
+      /* Get Content-Type: line from Curl_formpostheader.
+       */
+      char *contentType;
+      size_t linelength=0;
+      contentType = Curl_formpostheader((void *)&http->form,
+                                        &linelength);
+      if(!contentType) {
+        failf(data, "Could not get Content-Type header line!");
+        return CURLE_HTTP_POST_ERROR;
+      }
+
+      result = Curl_add_buffer(req_buffer, contentType, linelength);
+      if(result)
+        return result;
+    }
+
+    /* make the request end in a true CRLF */
+    result = Curl_add_buffer(req_buffer, "\r\n", 2);
+    if(result)
+      return result;
+
+    /* set upload size to the progress meter */
+    Curl_pgrsSetUploadSize(data, http->postsize);
+
+    /* fire away the whole request to the server */
+    result = Curl_add_buffer_send(req_buffer, conn,
+                                  &data->info.request_size, 0, FIRSTSOCKET);
+    if(result)
+      failf(data, "Failed sending POST request");
+    else
+      /* setup variables for the upcoming transfer */
+      Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
+                          &http->readbytecount, FIRSTSOCKET,
+                          &http->writebytecount);
+
+    if(result) {
+      Curl_formclean(&http->sendit); /* free that whole lot */
+      return result;
+    }
+
+    /* convert the form data */
+    result = Curl_convert_form(data, http->sendit);
+    if(result) {
+      Curl_formclean(&http->sendit); /* free that whole lot */
+      return result;
+    }
+
+    break;
+
+  case HTTPREQ_PUT: /* Let's PUT the data to the server! */
+
+    if(conn->bits.authneg)
+      postsize = 0;
+    else
+      postsize = data->set.infilesize;
+
+    if((postsize != -1) && !data->req.upload_chunky &&
+       !Curl_checkheaders(data, "Content-Length:")) {
+      /* only add Content-Length if not uploading chunked */
+      result = Curl_add_bufferf(req_buffer,
+                                "Content-Length: %" FORMAT_OFF_T "\r\n",
+                                postsize );
+      if(result)
+        return result;
+    }
+
+    result = expect100(data, conn, req_buffer);
+    if(result)
+      return result;
+
+    result = Curl_add_buffer(req_buffer, "\r\n", 2); /* end of headers */
+    if(result)
+      return result;
+
+    /* set the upload size to the progress meter */
+    Curl_pgrsSetUploadSize(data, postsize);
+
+    /* this sends the buffer and frees all the buffer resources */
+    result = Curl_add_buffer_send(req_buffer, conn,
+                                  &data->info.request_size, 0, FIRSTSOCKET);
+    if(result)
+      failf(data, "Failed sending PUT request");
+    else
+      /* prepare for transfer */
+      Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
+                          &http->readbytecount, postsize?FIRSTSOCKET:-1,
+                          postsize?&http->writebytecount:NULL);
+    if(result)
+      return result;
+    break;
+
+  case HTTPREQ_POST:
+    /* this is the simple POST, using x-www-form-urlencoded style */
+
+    if(conn->bits.authneg)
+      postsize = 0;
+    else {
+      /* figure out the size of the postfields */
+      postsize = (data->set.postfieldsize != -1)?
+        data->set.postfieldsize:
+        (data->set.postfields? (curl_off_t)strlen(data->set.postfields):-1);
+    }
+    if(!data->req.upload_chunky) {
+      /* We only set Content-Length and allow a custom Content-Length if
+         we don't upload data chunked, as RFC2616 forbids us to set both
+         kinds of headers (Transfer-Encoding: chunked and Content-Length) */
+
+      if(conn->bits.authneg || !Curl_checkheaders(data, "Content-Length:")) {
+        /* we allow replacing this header if not during auth negotiation,
+           although it isn't very wise to actually set your own */
+        result = Curl_add_bufferf(req_buffer,
+                                  "Content-Length: %" FORMAT_OFF_T"\r\n",
+                                  postsize);
+        if(result)
+          return result;
+      }
+    }
+
+    if(!Curl_checkheaders(data, "Content-Type:")) {
+      result = Curl_add_bufferf(req_buffer,
+                                "Content-Type: application/"
+                                "x-www-form-urlencoded\r\n");
+      if(result)
+        return result;
+    }
+
+    /* For really small posts we don't use Expect: headers at all, and for
+       the somewhat bigger ones we allow the app to disable it. Just make
+       sure that the expect100header is always set to the preferred value
+       here. */
+    ptr = Curl_checkheaders(data, "Expect:");
+    if(ptr) {
+      data->state.expect100header =
+        Curl_compareheader(ptr, "Expect:", "100-continue");
+    }
+    else if(postsize > TINY_INITIAL_POST_SIZE || postsize < 0) {
+      result = expect100(data, conn, req_buffer);
+      if(result)
+        return result;
+    }
+    else
+      data->state.expect100header = FALSE;
+
+    if(data->set.postfields) {
+
+      if(!data->state.expect100header &&
+         (postsize < MAX_INITIAL_POST_SIZE))  {
+        /* if we don't use expect: 100  AND
+           postsize is less than MAX_INITIAL_POST_SIZE
+
+           then append the post data to the HTTP request header. This limit
+           is no magic limit but only set to prevent really huge POSTs to
+           get the data duplicated with malloc() and family. */
+
+        result = Curl_add_buffer(req_buffer, "\r\n", 2); /* end of headers! */
+        if(result)
+          return result;
+
+        if(!data->req.upload_chunky) {
+          /* We're not sending it 'chunked', append it to the request
+             already now to reduce the number if send() calls */
+          result = Curl_add_buffer(req_buffer, data->set.postfields,
+                                   (size_t)postsize);
+          included_body = postsize;
+        }
+        else {
+          if(postsize) {
+            /* Append the POST data chunky-style */
+            result = Curl_add_bufferf(req_buffer, "%x\r\n", (int)postsize);
+            if(CURLE_OK == result) {
+              result = Curl_add_buffer(req_buffer, data->set.postfields,
+                                       (size_t)postsize);
+              if(CURLE_OK == result)
+                 result = Curl_add_buffer(req_buffer, "\r\n", 2);
+              included_body = postsize + 2;
+            }
+          }
+          if(CURLE_OK == result)
+            result = Curl_add_buffer(req_buffer,
+                                     "\x30\x0d\x0a\x0d\x0a", 5);
+          /* 0  CR  LF  CR  LF */
+          included_body += 5;
+        }
+        if(result)
+          return result;
+        /* Make sure the progress information is accurate */
+        Curl_pgrsSetUploadSize(data, postsize);
+      }
+      else {
+        /* A huge POST coming up, do data separate from the request */
+        http->postsize = postsize;
+        http->postdata = data->set.postfields;
+
+        http->sending = HTTPSEND_BODY;
+
+        conn->fread_func = (curl_read_callback)readmoredata;
+        conn->fread_in = (void *)conn;
+
+        /* set the upload size to the progress meter */
+        Curl_pgrsSetUploadSize(data, http->postsize);
+
+        result = Curl_add_buffer(req_buffer, "\r\n", 2); /* end of headers! */
+        if(result)
+          return result;
+      }
+    }
+    else {
+      result = Curl_add_buffer(req_buffer, "\r\n", 2); /* end of headers! */
+      if(result)
+        return result;
+
+      if(data->req.upload_chunky && conn->bits.authneg) {
+        /* Chunky upload is selected and we're negotiating auth still, send
+           end-of-data only */
+        result = Curl_add_buffer(req_buffer,
+                                 "\x30\x0d\x0a\x0d\x0a", 5);
+        /* 0  CR  LF  CR  LF */
+        if(result)
+          return result;
+      }
+
+      else if(data->set.postfieldsize) {
+        /* set the upload size to the progress meter */
+        Curl_pgrsSetUploadSize(data, postsize?postsize:-1);
+
+        /* set the pointer to mark that we will send the post body using the
+           read callback, but only if we're not in authenticate
+           negotiation  */
+        if(!conn->bits.authneg) {
+          http->postdata = (char *)&http->postdata;
+          http->postsize = postsize;
+        }
+      }
+    }
+    /* issue the request */
+    result = Curl_add_buffer_send(req_buffer, conn, &data->info.request_size,
+                                  (size_t)included_body, FIRSTSOCKET);
+
+    if(result)
+      failf(data, "Failed sending HTTP POST request");
+    else
+      Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
+                          &http->readbytecount, http->postdata?FIRSTSOCKET:-1,
+                          http->postdata?&http->writebytecount:NULL);
+    break;
+
+  default:
+    result = Curl_add_buffer(req_buffer, "\r\n", 2);
+    if(result)
+      return result;
+
+    /* issue the request */
+    result = Curl_add_buffer_send(req_buffer, conn,
+                                  &data->info.request_size, 0, FIRSTSOCKET);
+
+    if(result)
+      failf(data, "Failed sending HTTP request");
+    else
+      /* HTTP GET/HEAD download: */
+      Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE, &http->readbytecount,
+                          http->postdata?FIRSTSOCKET:-1,
+                          http->postdata?&http->writebytecount:NULL);
+  }
+  if(result)
+    return result;
+
+  if(http->writebytecount) {
+    /* if a request-body has been sent off, we make sure this progress is noted
+       properly */
+    Curl_pgrsSetUploadCounter(data, http->writebytecount);
+    if(Curl_pgrsUpdate(conn))
+      result = CURLE_ABORTED_BY_CALLBACK;
+
+    if(http->writebytecount >= postsize) {
+      /* already sent the entire request body, mark the "upload" as
+         complete */
+      infof(data, "upload completely sent off: %" FORMAT_OFF_T " out of "
+            "%" FORMAT_OFF_T " bytes\n",
+            http->writebytecount, postsize);
+      data->req.upload_done = TRUE;
+      data->req.keepon &= ~KEEP_SEND; /* we're done writing */
+      data->req.exp100 = EXP100_SEND_DATA; /* already sent */
+    }
+  }
+
+  return result;
+}
+
+/*
+ * checkhttpprefix()
+ *
+ * Returns TRUE if member of the list matches prefix of string
+ */
+static bool
+checkhttpprefix(struct SessionHandle *data,
+                const char *s)
+{
+  struct curl_slist *head = data->set.http200aliases;
+  bool rc = FALSE;
+#ifdef CURL_DOES_CONVERSIONS
+  /* convert from the network encoding using a scratch area */
+  char *scratch = strdup(s);
+  if(NULL == scratch) {
+    failf (data, "Failed to allocate memory for conversion!");
+    return FALSE; /* can't return CURLE_OUT_OF_MEMORY so return FALSE */
+  }
+  if(CURLE_OK != Curl_convert_from_network(data, scratch, strlen(s)+1)) {
+    /* Curl_convert_from_network calls failf if unsuccessful */
+    free(scratch);
+    return FALSE; /* can't return CURLE_foobar so return FALSE */
+  }
+  s = scratch;
+#endif /* CURL_DOES_CONVERSIONS */
+
+  while(head) {
+    if(checkprefix(head->data, s)) {
+      rc = TRUE;
+      break;
+    }
+    head = head->next;
+  }
+
+  if(!rc && (checkprefix("HTTP/", s)))
+    rc = TRUE;
+
+#ifdef CURL_DOES_CONVERSIONS
+  free(scratch);
+#endif /* CURL_DOES_CONVERSIONS */
+  return rc;
+}
+
+#ifndef CURL_DISABLE_RTSP
+static bool
+checkrtspprefix(struct SessionHandle *data,
+                const char *s)
+{
+
+#ifdef CURL_DOES_CONVERSIONS
+  /* convert from the network encoding using a scratch area */
+  char *scratch = strdup(s);
+  if(NULL == scratch) {
+    failf (data, "Failed to allocate memory for conversion!");
+    return FALSE; /* can't return CURLE_OUT_OF_MEMORY so return FALSE */
+  }
+  if(CURLE_OK != Curl_convert_from_network(data, scratch, strlen(s)+1)) {
+    /* Curl_convert_from_network calls failf if unsuccessful */
+    free(scratch);
+    return FALSE; /* can't return CURLE_foobar so return FALSE */
+  }
+  s = scratch;
+#else
+  (void)data; /* unused */
+#endif /* CURL_DOES_CONVERSIONS */
+  if(checkprefix("RTSP/", s))
+    return TRUE;
+  else
+    return FALSE;
+}
+#endif /* CURL_DISABLE_RTSP */
+
+static bool
+checkprotoprefix(struct SessionHandle *data, struct connectdata *conn,
+                 const char *s)
+{
+#ifndef CURL_DISABLE_RTSP
+  if(conn->handler->protocol & CURLPROTO_RTSP)
+    return checkrtspprefix(data, s);
+#else
+  (void)conn;
+#endif /* CURL_DISABLE_RTSP */
+
+  return checkhttpprefix(data, s);
+}
+
+/*
+ * header_append() copies a chunk of data to the end of the already received
+ * header. We make sure that the full string fit in the allocated header
+ * buffer, or else we enlarge it.
+ */
+static CURLcode header_append(struct SessionHandle *data,
+                              struct SingleRequest *k,
+                              size_t length)
+{
+  if(k->hbuflen + length >= data->state.headersize) {
+    /* We enlarge the header buffer as it is too small */
+    char *newbuff;
+    size_t hbufp_index;
+    size_t newsize;
+
+    if(k->hbuflen + length > CURL_MAX_HTTP_HEADER) {
+      /* The reason to have a max limit for this is to avoid the risk of a bad
+         server feeding libcurl with a never-ending header that will cause
+         reallocs infinitely */
+      failf (data, "Avoided giant realloc for header (max is %d)!",
+             CURL_MAX_HTTP_HEADER);
+      return CURLE_OUT_OF_MEMORY;
+    }
+
+    newsize=CURLMAX((k->hbuflen+ length)*3/2, data->state.headersize*2);
+    hbufp_index = k->hbufp - data->state.headerbuff;
+    newbuff = realloc(data->state.headerbuff, newsize);
+    if(!newbuff) {
+      failf (data, "Failed to alloc memory for big header!");
+      return CURLE_OUT_OF_MEMORY;
+    }
+    data->state.headersize=newsize;
+    data->state.headerbuff = newbuff;
+    k->hbufp = data->state.headerbuff + hbufp_index;
+  }
+  memcpy(k->hbufp, k->str_start, length);
+  k->hbufp += length;
+  k->hbuflen += length;
+  *k->hbufp = 0;
+
+  return CURLE_OK;
+}
+
+static void print_http_error(struct SessionHandle *data)
+{
+  struct SingleRequest *k = &data->req;
+  char *beg = k->p;
+
+  /* make sure that data->req.p points to the HTTP status line */
+  if(!strncmp(beg, "HTTP", 4)) {
+
+    /* skip to HTTP status code */
+    beg = strchr(beg, ' ');
+    if(beg && *++beg) {
+
+      /* find trailing CR */
+      char end_char = '\r';
+      char *end = strchr(beg, end_char);
+      if(!end) {
+        /* try to find LF (workaround for non-compliant HTTP servers) */
+        end_char = '\n';
+        end = strchr(beg, end_char);
+      }
+
+      if(end) {
+        /* temporarily replace CR or LF by NUL and print the error message */
+        *end = '\0';
+        failf(data, "The requested URL returned error: %s", beg);
+
+        /* restore the previously replaced CR or LF */
+        *end = end_char;
+        return;
+      }
+    }
+  }
+
+  /* fall-back to printing the HTTP status code only */
+  failf(data, "The requested URL returned error: %d", k->httpcode);
+}
+
+/*
+ * Read any HTTP header lines from the server and pass them to the client app.
+ */
+CURLcode Curl_http_readwrite_headers(struct SessionHandle *data,
+                                       struct connectdata *conn,
+                                       ssize_t *nread,
+                                       bool *stop_reading)
+{
+  CURLcode result;
+  struct SingleRequest *k = &data->req;
+
+  /* header line within buffer loop */
+  do {
+    size_t rest_length;
+    size_t full_length;
+    int writetype;
+
+    /* str_start is start of line within buf */
+    k->str_start = k->str;
+
+    /* data is in network encoding so use 0x0a instead of '\n' */
+    k->end_ptr = memchr(k->str_start, 0x0a, *nread);
+
+    if(!k->end_ptr) {
+      /* Not a complete header line within buffer, append the data to
+         the end of the headerbuff. */
+      result = header_append(data, k, *nread);
+      if(result)
+        return result;
+
+      if(!k->headerline && (k->hbuflen>5)) {
+        /* make a first check that this looks like a protocol header */
+        if(!checkprotoprefix(data, conn, data->state.headerbuff)) {
+          /* this is not the beginning of a protocol first header line */
+          k->header = FALSE;
+          k->badheader = HEADER_ALLBAD;
+          break;
+        }
+      }
+
+      break; /* read more and try again */
+    }
+
+    /* decrease the size of the remaining (supposed) header line */
+    rest_length = (k->end_ptr - k->str)+1;
+    *nread -= (ssize_t)rest_length;
+
+    k->str = k->end_ptr + 1; /* move past new line */
+
+    full_length = k->str - k->str_start;
+
+    result = header_append(data, k, full_length);
+    if(result)
+      return result;
+
+    k->end_ptr = k->hbufp;
+    k->p = data->state.headerbuff;
+
+    /****
+     * We now have a FULL header line that p points to
+     *****/
+
+    if(!k->headerline) {
+      /* the first read header */
+      if((k->hbuflen>5) &&
+         !checkprotoprefix(data, conn, data->state.headerbuff)) {
+        /* this is not the beginning of a protocol first header line */
+        k->header = FALSE;
+        if(*nread)
+          /* since there's more, this is a partial bad header */
+          k->badheader = HEADER_PARTHEADER;
+        else {
+          /* this was all we read so it's all a bad header */
+          k->badheader = HEADER_ALLBAD;
+          *nread = (ssize_t)rest_length;
+        }
+        break;
+      }
+    }
+
+    /* headers are in network encoding so
+       use 0x0a and 0x0d instead of '\n' and '\r' */
+    if((0x0a == *k->p) || (0x0d == *k->p)) {
+      size_t headerlen;
+      /* Zero-length header line means end of headers! */
+
+#ifdef CURL_DOES_CONVERSIONS
+      if(0x0d == *k->p) {
+        *k->p = '\r'; /* replace with CR in host encoding */
+        k->p++;       /* pass the CR byte */
+      }
+      if(0x0a == *k->p) {
+        *k->p = '\n'; /* replace with LF in host encoding */
+        k->p++;       /* pass the LF byte */
+      }
+#else
+      if('\r' == *k->p)
+        k->p++; /* pass the \r byte */
+      if('\n' == *k->p)
+        k->p++; /* pass the \n byte */
+#endif /* CURL_DOES_CONVERSIONS */
+
+      if(100 <= k->httpcode && 199 >= k->httpcode) {
+        /*
+         * We have made a HTTP PUT or POST and this is 1.1-lingo
+         * that tells us that the server is OK with this and ready
+         * to receive the data.
+         * However, we'll get more headers now so we must get
+         * back into the header-parsing state!
+         */
+        k->header = TRUE;
+        k->headerline = 0; /* restart the header line counter */
+
+        /* if we did wait for this do enable write now! */
+        if(k->exp100) {
+          k->exp100 = EXP100_SEND_DATA;
+          k->keepon |= KEEP_SEND;
+        }
+      }
+      else {
+        k->header = FALSE; /* no more header to parse! */
+
+        if((k->size == -1) && !k->chunk && !conn->bits.close &&
+           (conn->httpversion >= 11) &&
+           !(conn->handler->protocol & CURLPROTO_RTSP) &&
+           data->set.httpreq != HTTPREQ_HEAD) {
+          /* On HTTP 1.1, when connection is not to get closed, but no
+             Content-Length nor Content-Encoding chunked have been
+             received, according to RFC2616 section 4.4 point 5, we
+             assume that the server will close the connection to
+             signal the end of the document. */
+          infof(data, "no chunk, no close, no size. Assume close to "
+                "signal end\n");
+          conn->bits.close = TRUE;
+        }
+      }
+
+      /*
+       * When all the headers have been parsed, see if we should give
+       * up and return an error.
+       */
+      if(http_should_fail(conn)) {
+        failf (data, "The requested URL returned error: %d",
+               k->httpcode);
+        return CURLE_HTTP_RETURNED_ERROR;
+      }
+
+      /* now, only output this if the header AND body are requested:
+       */
+      writetype = CLIENTWRITE_HEADER;
+      if(data->set.include_header)
+        writetype |= CLIENTWRITE_BODY;
+
+      headerlen = k->p - data->state.headerbuff;
+
+      result = Curl_client_write(conn, writetype,
+                                 data->state.headerbuff,
+                                 headerlen);
+      if(result)
+        return result;
+
+      data->info.header_size += (long)headerlen;
+      data->req.headerbytecount += (long)headerlen;
+
+      data->req.deductheadercount =
+        (100 <= k->httpcode && 199 >= k->httpcode)?data->req.headerbytecount:0;
+
+      if(!*stop_reading) {
+        /* Curl_http_auth_act() checks what authentication methods
+         * that are available and decides which one (if any) to
+         * use. It will set 'newurl' if an auth method was picked. */
+        result = Curl_http_auth_act(conn);
+
+        if(result)
+          return result;
+
+        if(k->httpcode >= 300) {
+          if((!conn->bits.authneg) && !conn->bits.close &&
+             !conn->bits.rewindaftersend) {
+            /*
+             * General treatment of errors when about to send data. Including :
+             * "417 Expectation Failed", while waiting for 100-continue.
+             *
+             * The check for close above is done simply because of something
+             * else has already deemed the connection to get closed then
+             * something else should've considered the big picture and we
+             * avoid this check.
+             *
+             * rewindaftersend indicates that something has told libcurl to
+             * continue sending even if it gets discarded
+             */
+
+            switch(data->set.httpreq) {
+            case HTTPREQ_PUT:
+            case HTTPREQ_POST:
+            case HTTPREQ_POST_FORM:
+              /* We got an error response. If this happened before the whole
+               * request body has been sent we stop sending and mark the
+               * connection for closure after we've read the entire response.
+               */
+              if(!k->upload_done) {
+                infof(data, "HTTP error before end of send, stop sending\n");
+                conn->bits.close = TRUE; /* close after this */
+                k->upload_done = TRUE;
+                k->keepon &= ~KEEP_SEND; /* don't send */
+                if(data->state.expect100header)
+                  k->exp100 = EXP100_FAILED;
+              }
+              break;
+
+            default: /* default label present to avoid compiler warnings */
+              break;
+            }
+          }
+        }
+
+        if(conn->bits.rewindaftersend) {
+          /* We rewind after a complete send, so thus we continue
+             sending now */
+          infof(data, "Keep sending data to get tossed away!\n");
+          k->keepon |= KEEP_SEND;
+        }
+      }
+
+      if(!k->header) {
+        /*
+         * really end-of-headers.
+         *
+         * If we requested a "no body", this is a good time to get
+         * out and return home.
+         */
+        if(data->set.opt_no_body)
+          *stop_reading = TRUE;
+        else {
+          /* If we know the expected size of this document, we set the
+             maximum download size to the size of the expected
+             document or else, we won't know when to stop reading!
+
+             Note that we set the download maximum even if we read a
+             "Connection: close" header, to make sure that
+             "Content-Length: 0" still prevents us from attempting to
+             read the (missing) response-body.
+          */
+          /* According to RFC2616 section 4.4, we MUST ignore
+             Content-Length: headers if we are now receiving data
+             using chunked Transfer-Encoding.
+          */
+          if(k->chunk)
+            k->maxdownload = k->size = -1;
+        }
+        if(-1 != k->size) {
+          /* We do this operation even if no_body is true, since this
+             data might be retrieved later with curl_easy_getinfo()
+             and its CURLINFO_CONTENT_LENGTH_DOWNLOAD option. */
+
+          Curl_pgrsSetDownloadSize(data, k->size);
+          k->maxdownload = k->size;
+        }
+
+        /* If max download size is *zero* (nothing) we already
+           have nothing and can safely return ok now! */
+        if(0 == k->maxdownload)
+          *stop_reading = TRUE;
+
+        if(*stop_reading) {
+          /* we make sure that this socket isn't read more now */
+          k->keepon &= ~KEEP_RECV;
+        }
+
+        if(data->set.verbose)
+          Curl_debug(data, CURLINFO_HEADER_IN,
+                     k->str_start, headerlen, conn);
+        break;          /* exit header line loop */
+      }
+
+      /* We continue reading headers, so reset the line-based
+         header parsing variables hbufp && hbuflen */
+      k->hbufp = data->state.headerbuff;
+      k->hbuflen = 0;
+      continue;
+    }
+
+    /*
+     * Checks for special headers coming up.
+     */
+
+    if(!k->headerline++) {
+      /* This is the first header, it MUST be the error code line
+         or else we consider this to be the body right away! */
+      int httpversion_major;
+      int rtspversion_major;
+      int nc = 0;
+#ifdef CURL_DOES_CONVERSIONS
+#define HEADER1 scratch
+#define SCRATCHSIZE 21
+      CURLcode res;
+      char scratch[SCRATCHSIZE+1]; /* "HTTP/major.minor 123" */
+      /* We can't really convert this yet because we
+         don't know if it's the 1st header line or the body.
+         So we do a partial conversion into a scratch area,
+         leaving the data at k->p as-is.
+      */
+      strncpy(&scratch[0], k->p, SCRATCHSIZE);
+      scratch[SCRATCHSIZE] = 0; /* null terminate */
+      res = Curl_convert_from_network(data,
+                                      &scratch[0],
+                                      SCRATCHSIZE);
+      if(res)
+        /* Curl_convert_from_network calls failf if unsuccessful */
+        return res;
+#else
+#define HEADER1 k->p /* no conversion needed, just use k->p */
+#endif /* CURL_DOES_CONVERSIONS */
+
+      if(conn->handler->protocol & CURLPROTO_HTTP) {
+        nc = sscanf(HEADER1,
+                    " HTTP/%d.%d %3d",
+                    &httpversion_major,
+                    &conn->httpversion,
+                    &k->httpcode);
+        if(nc==3) {
+          conn->httpversion += 10 * httpversion_major;
+        }
+        else {
+          /* this is the real world, not a Nirvana
+             NCSA 1.5.x returns this crap when asked for HTTP/1.1
+          */
+          nc=sscanf(HEADER1, " HTTP %3d", &k->httpcode);
+          conn->httpversion = 10;
+
+          /* If user has set option HTTP200ALIASES,
+             compare header line against list of aliases
+          */
+          if(!nc) {
+            if(checkhttpprefix(data, k->p)) {
+              nc = 1;
+              k->httpcode = 200;
+              conn->httpversion = 10;
+            }
+          }
+        }
+      }
+      else if(conn->handler->protocol & CURLPROTO_RTSP) {
+        nc = sscanf(HEADER1,
+                    " RTSP/%d.%d %3d",
+                    &rtspversion_major,
+                    &conn->rtspversion,
+                    &k->httpcode);
+        if(nc==3) {
+          conn->rtspversion += 10 * rtspversion_major;
+          conn->httpversion = 11; /* For us, RTSP acts like HTTP 1.1 */
+        }
+        else {
+          /* TODO: do we care about the other cases here? */
+          nc = 0;
+        }
+      }
+
+      if(nc) {
+        data->info.httpcode = k->httpcode;
+
+        data->info.httpversion = conn->httpversion;
+        if(!data->state.httpversion ||
+           data->state.httpversion > conn->httpversion)
+          /* store the lowest server version we encounter */
+          data->state.httpversion = conn->httpversion;
+
+        /*
+         * This code executes as part of processing the header.  As a
+         * result, it's not totally clear how to interpret the
+         * response code yet as that depends on what other headers may
+         * be present.  401 and 407 may be errors, but may be OK
+         * depending on how authentication is working.  Other codes
+         * are definitely errors, so give up here.
+         */
+        if(data->set.http_fail_on_error && (k->httpcode >= 400) &&
+           ((k->httpcode != 401) || !conn->bits.user_passwd) &&
+           ((k->httpcode != 407) || !conn->bits.proxy_user_passwd) ) {
+
+          if(data->state.resume_from &&
+             (data->set.httpreq==HTTPREQ_GET) &&
+             (k->httpcode == 416)) {
+            /* "Requested Range Not Satisfiable", just proceed and
+               pretend this is no error */
+          }
+          else {
+            /* serious error, go home! */
+            print_http_error(data);
+            return CURLE_HTTP_RETURNED_ERROR;
+          }
+        }
+
+        if(conn->httpversion == 10) {
+          /* Default action for HTTP/1.0 must be to close, unless
+             we get one of those fancy headers that tell us the
+             server keeps it open for us! */
+          infof(data, "HTTP 1.0, assume close after body\n");
+          conn->bits.close = TRUE;
+        }
+        else if(conn->httpversion >= 11 &&
+                !conn->bits.close) {
+
+          /* If HTTP version is >= 1.1 and connection is persistent
+             server supports pipelining. */
+          DEBUGF(infof(data,
+                       "HTTP 1.1 or later with persistent connection, "
+                       "pipelining supported\n"));
+          conn->server_supports_pipelining = TRUE;
+        }
+
+        switch(k->httpcode) {
+        case 204:
+          /* (quote from RFC2616, section 10.2.5): The server has
+           * fulfilled the request but does not need to return an
+           * entity-body ... The 204 response MUST NOT include a
+           * message-body, and thus is always terminated by the first
+           * empty line after the header fields. */
+          /* FALLTHROUGH */
+        case 304:
+          /* (quote from RFC2616, section 10.3.5): The 304 response
+           * MUST NOT contain a message-body, and thus is always
+           * terminated by the first empty line after the header
+           * fields.  */
+          if(data->set.timecondition)
+            data->info.timecond = TRUE;
+          k->size=0;
+          k->maxdownload=0;
+          k->ignorecl = TRUE; /* ignore Content-Length headers */
+          break;
+        default:
+          /* nothing */
+          break;
+        }
+      }
+      else {
+        k->header = FALSE;   /* this is not a header line */
+        break;
+      }
+    }
+
+    result = Curl_convert_from_network(data, k->p, strlen(k->p));
+    /* Curl_convert_from_network calls failf if unsuccessful */
+    if(result)
+      return result;
+
+    /* Check for Content-Length: header lines to get size */
+    if(!k->ignorecl && !data->set.ignorecl &&
+       checkprefix("Content-Length:", k->p)) {
+      curl_off_t contentlength = curlx_strtoofft(k->p+15, NULL, 10);
+      if(data->set.max_filesize &&
+         contentlength > data->set.max_filesize) {
+        failf(data, "Maximum file size exceeded");
+        return CURLE_FILESIZE_EXCEEDED;
+      }
+      if(contentlength >= 0) {
+        k->size = contentlength;
+        k->maxdownload = k->size;
+        /* we set the progress download size already at this point
+           just to make it easier for apps/callbacks to extract this
+           info as soon as possible */
+        Curl_pgrsSetDownloadSize(data, k->size);
+      }
+      else {
+        /* Negative Content-Length is really odd, and we know it
+           happens for example when older Apache servers send large
+           files */
+        conn->bits.close = TRUE;
+        infof(data, "Negative content-length: %" FORMAT_OFF_T
+              ", closing after transfer\n", contentlength);
+      }
+    }
+    /* check for Content-Type: header lines to get the MIME-type */
+    else if(checkprefix("Content-Type:", k->p)) {
+      char *contenttype = copy_header_value(k->p);
+      if(!contenttype)
+        return CURLE_OUT_OF_MEMORY;
+      if(!*contenttype)
+        /* ignore empty data */
+        free(contenttype);
+      else {
+        Curl_safefree(data->info.contenttype);
+        data->info.contenttype = contenttype;
+      }
+    }
+    else if((conn->httpversion == 10) &&
+            conn->bits.httpproxy &&
+            Curl_compareheader(k->p,
+                               "Proxy-Connection:", "keep-alive")) {
+      /*
+       * When a HTTP/1.0 reply comes when using a proxy, the
+       * 'Proxy-Connection: keep-alive' line tells us the
+       * connection will be kept alive for our pleasure.
+       * Default action for 1.0 is to close.
+       */
+      conn->bits.close = FALSE; /* don't close when done */
+      infof(data, "HTTP/1.0 proxy connection set to keep alive!\n");
+    }
+    else if((conn->httpversion == 11) &&
+            conn->bits.httpproxy &&
+            Curl_compareheader(k->p,
+                               "Proxy-Connection:", "close")) {
+      /*
+       * We get a HTTP/1.1 response from a proxy and it says it'll
+       * close down after this transfer.
+       */
+      conn->bits.close = TRUE; /* close when done */
+      infof(data, "HTTP/1.1 proxy connection set close!\n");
+    }
+    else if((conn->httpversion == 10) &&
+            Curl_compareheader(k->p, "Connection:", "keep-alive")) {
+      /*
+       * A HTTP/1.0 reply with the 'Connection: keep-alive' line
+       * tells us the connection will be kept alive for our
+       * pleasure.  Default action for 1.0 is to close.
+       *
+       * [RFC2068, section 19.7.1] */
+      conn->bits.close = FALSE; /* don't close when done */
+      infof(data, "HTTP/1.0 connection set to keep alive!\n");
+    }
+    else if(Curl_compareheader(k->p, "Connection:", "close")) {
+      /*
+       * [RFC 2616, section 8.1.2.1]
+       * "Connection: close" is HTTP/1.1 language and means that
+       * the connection will close when this request has been
+       * served.
+       */
+      conn->bits.close = TRUE; /* close when done */
+    }
+    else if(checkprefix("Transfer-Encoding:", k->p)) {
+      /* One or more encodings. We check for chunked and/or a compression
+         algorithm. */
+      /*
+       * [RFC 2616, section 3.6.1] A 'chunked' transfer encoding
+       * means that the server will send a series of "chunks". Each
+       * chunk starts with line with info (including size of the
+       * coming block) (terminated with CRLF), then a block of data
+       * with the previously mentioned size. There can be any amount
+       * of chunks, and a chunk-data set to zero signals the
+       * end-of-chunks. */
+
+      char *start;
+
+      /* Find the first non-space letter */
+      start = k->p + 18;
+
+      for(;;) {
+        /* skip whitespaces and commas */
+        while(*start && (ISSPACE(*start) || (*start == ',')))
+          start++;
+
+        if(checkprefix("chunked", start)) {
+          k->chunk = TRUE; /* chunks coming our way */
+
+          /* init our chunky engine */
+          Curl_httpchunk_init(conn);
+
+          start += 7;
+        }
+
+        if(k->auto_decoding)
+          /* TODO: we only support the first mentioned compression for now */
+          break;
+
+        if(checkprefix("identity", start)) {
+          k->auto_decoding = IDENTITY;
+          start += 8;
+        }
+        else if(checkprefix("deflate", start)) {
+          k->auto_decoding = DEFLATE;
+          start += 7;
+        }
+        else if(checkprefix("gzip", start)) {
+          k->auto_decoding = GZIP;
+          start += 4;
+        }
+        else if(checkprefix("x-gzip", start)) {
+          k->auto_decoding = GZIP;
+          start += 6;
+        }
+        else if(checkprefix("compress", start)) {
+          k->auto_decoding = COMPRESS;
+          start += 8;
+        }
+        else if(checkprefix("x-compress", start)) {
+          k->auto_decoding = COMPRESS;
+          start += 10;
+        }
+        else
+          /* unknown! */
+          break;
+
+      }
+
+    }
+    else if(checkprefix("Content-Encoding:", k->p) &&
+            data->set.str[STRING_ENCODING]) {
+      /*
+       * Process Content-Encoding. Look for the values: identity,
+       * gzip, deflate, compress, x-gzip and x-compress. x-gzip and
+       * x-compress are the same as gzip and compress. (Sec 3.5 RFC
+       * 2616). zlib cannot handle compress.  However, errors are
+       * handled further down when the response body is processed
+       */
+      char *start;
+
+      /* Find the first non-space letter */
+      start = k->p + 17;
+      while(*start && ISSPACE(*start))
+        start++;
+
+      /* Record the content-encoding for later use */
+      if(checkprefix("identity", start))
+        k->auto_decoding = IDENTITY;
+      else if(checkprefix("deflate", start))
+        k->auto_decoding = DEFLATE;
+      else if(checkprefix("gzip", start)
+              || checkprefix("x-gzip", start))
+        k->auto_decoding = GZIP;
+      else if(checkprefix("compress", start)
+              || checkprefix("x-compress", start))
+        k->auto_decoding = COMPRESS;
+    }
+    else if(checkprefix("Content-Range:", k->p)) {
+      /* Content-Range: bytes [num]-
+         Content-Range: bytes: [num]-
+         Content-Range: [num]-
+
+         The second format was added since Sun's webserver
+         JavaWebServer/1.1.1 obviously sends the header this way!
+         The third added since some servers use that!
+      */
+
+      char *ptr = k->p + 14;
+
+      /* Move forward until first digit */
+      while(*ptr && !ISDIGIT(*ptr))
+        ptr++;
+
+      k->offset = curlx_strtoofft(ptr, NULL, 10);
+
+      if(data->state.resume_from == k->offset)
+        /* we asked for a resume and we got it */
+        k->content_range = TRUE;
+    }
+#if !defined(CURL_DISABLE_COOKIES)
+    else if(data->cookies &&
+            checkprefix("Set-Cookie:", k->p)) {
+      Curl_share_lock(data, CURL_LOCK_DATA_COOKIE,
+                      CURL_LOCK_ACCESS_SINGLE);
+      Curl_cookie_add(data,
+                      data->cookies, TRUE, k->p+11,
+                      /* If there is a custom-set Host: name, use it
+                         here, or else use real peer host name. */
+                      conn->allocptr.cookiehost?
+                      conn->allocptr.cookiehost:conn->host.name,
+                      data->state.path);
+      Curl_share_unlock(data, CURL_LOCK_DATA_COOKIE);
+    }
+#endif
+    else if(checkprefix("Last-Modified:", k->p) &&
+            (data->set.timecondition || data->set.get_filetime) ) {
+      time_t secs=time(NULL);
+      k->timeofdoc = curl_getdate(k->p+strlen("Last-Modified:"),
+                                  &secs);
+      if(data->set.get_filetime)
+        data->info.filetime = (long)k->timeofdoc;
+    }
+    else if((checkprefix("WWW-Authenticate:", k->p) &&
+             (401 == k->httpcode)) ||
+            (checkprefix("Proxy-authenticate:", k->p) &&
+             (407 == k->httpcode))) {
+      result = Curl_http_input_auth(conn, k->httpcode, k->p);
+      if(result)
+        return result;
+    }
+    else if((k->httpcode >= 300 && k->httpcode < 400) &&
+            checkprefix("Location:", k->p) &&
+            !data->req.location) {
+      /* this is the URL that the server advises us to use instead */
+      char *location = copy_header_value(k->p);
+      if(!location)
+        return CURLE_OUT_OF_MEMORY;
+      if(!*location)
+        /* ignore empty data */
+        free(location);
+      else {
+        data->req.location = location;
+
+        if(data->set.http_follow_location) {
+          DEBUGASSERT(!data->req.newurl);
+          data->req.newurl = strdup(data->req.location); /* clone */
+          if(!data->req.newurl)
+            return CURLE_OUT_OF_MEMORY;
+
+          /* some cases of POST and PUT etc needs to rewind the data
+             stream at this point */
+          result = http_perhapsrewind(conn);
+          if(result)
+            return result;
+        }
+      }
+    }
+    else if(conn->handler->protocol & CURLPROTO_RTSP) {
+      result = Curl_rtsp_parseheader(conn, k->p);
+      if(result)
+        return result;
+    }
+
+    /*
+     * End of header-checks. Write them to the client.
+     */
+
+    writetype = CLIENTWRITE_HEADER;
+    if(data->set.include_header)
+      writetype |= CLIENTWRITE_BODY;
+
+    if(data->set.verbose)
+      Curl_debug(data, CURLINFO_HEADER_IN,
+                 k->p, (size_t)k->hbuflen, conn);
+
+    result = Curl_client_write(conn, writetype, k->p, k->hbuflen);
+    if(result)
+      return result;
+
+    data->info.header_size += (long)k->hbuflen;
+    data->req.headerbytecount += (long)k->hbuflen;
+
+    /* reset hbufp pointer && hbuflen */
+    k->hbufp = data->state.headerbuff;
+    k->hbuflen = 0;
+  }
+  while(!*stop_reading && *k->str); /* header line within buffer */
+
+  /* We might have reached the end of the header part here, but
+     there might be a non-header part left in the end of the read
+     buffer. */
+
+  return CURLE_OK;
+}
+
+#endif /* CURL_DISABLE_HTTP */