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Dropbox Business API 'bad request' error

Hi Team,

we are using the Dropbox REST API with OAuth2.

When attempting to get list of groups we are receiving an 'Error 400 bad request' error.

Below is the sample code written in C#:

  var webRequest = (HttpWebRequest)WebRequest.Create("https://api.dropbox.com/1/team/groups/list");
  webRequest.Method = "POST";
  webRequest.Accept = "application/json";
  webRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36 OPR/26.0.1656.60";
  webRequest.ContentType = "application/json";
  webRequest.Headers.Add("Authorization: Bearer <accesToken>"); 

  string postData = JsonConvert.SerializeObject(bodyContent);
  byte[] bytes = new byte[postData.Length * sizeof(char)];
  System.Buffer.BlockCopy(postData.ToCharArray(), 0, bytes, 0, bytes.Length);

  webRequest.ContentLength = bytes.Length;
  Stream dataStream = webRequest.GetRequestStream();
  dataStream.Write(bytes, 0, bytes.Length);
  dataStream.Close();
  var webResponse = (HttpWebResponse)webRequest.GetResponse();

Any suggestion on how to fix this error ?

Thank you

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Comments

Steve M.

What's the content of the response from the server? There should be an error message explaining what the issue is.

(Or perhaps you can share what's in bodyContent so we can guess as to the issue.)

Steve M.

BTW, this code is untested, but I think you can simplify to this:

var webRequest = (HttpWebRequest)WebRequest.Create("https://api.dropbox.com/1/team/groups/list");
webRequest.Method = "POST";
webRequest.ContentType = "application/json";
webRequest.Headers.Add("Authorization: Bearer <accesToken>"); 

using (var streamWriter = new StreamWriter(webRequest.GetRequestStream()))
{
    streamWriter.Write(JsonConvert.SerializeObject(bodyContent));
}

var webResponse = (HttpWebResponse)webRequest.GetResponse();

FYI, in the case of /groups/list, the JSON body should just be {}, since this method doesn't take any parameters.

Tamas B.

Thank you for your response,

the 'bodyContent' variable contains an empty JSON dictionary ( {} ).

The error details state the following:

Status: Protocol Error

Status Code: Bad Request

Steve M.

What's the actual body of the error response, though? The HTTP response should contain a body with details.

Steve M.

FYI, I ran my version of the code (with var bodyContent = new { };), and it succeeds. If yours is still failing, we'll really need to see the response body.

Tamas B.

The HTTP response contains an empty body (content length = -1 )

Tamas B.

The issue have been resolved. Turns out the problem was caused by the string which was returned by the method call 'JsonConvert.SerializeObject()'.

Thank you for your help

Steve M.

Out of curiosity, in case it happens to someone else in the future, what was the issue with the string that came back from JsonConvert.SerializeObject?

Tamas B.

The function returned the following string: "{ }"

the request failed on the additional quote marks