[shows all files in folder "dir" ("dir" can be omitted for root folder)]
[returns download link for file or folder with specified path ("path" is relative from root folder)]
[deletes file or folder with specified path ("path" is relative from root folder)]
[Bad or expired token. This can happen if the user or Dropbox revoked or expired an access token. To fix, you should re-authenticate the user]
[Bad OAuth request (wrong consumer key, bad nonce, expired timestamp...). Unfortunately, re-authenticating the user won't help here]
[File or folder not found at the specified path]
[Request method not expected (generally should be GET or POST)]
[Your app is making too many requests and is being rate limited. 429s can trigger on a per-app or per-user basis]
[If the response includes the Retry-After header, this means your OAuth 1.0 app is being rate limited. Otherwise, this indicates a transient server error, and your app should retry its request.]
[User is over Dropbox storage quota]