Dfyjkt

I am calling an API from by C# Windows service. In some cases the following error is being raised.

The request body did not contain the specified number of bytes. Got 101,379, expected 102,044

In the RAW Request captured using fiddler content length as specified.

Content-Length: 102044

In the response from the API I am receiving the following message.

The request body did not contain the specified number of bytes. Got 101,379, expected 102,044

The strange thing for me is that it does not happen for each and every request, it is generated randomly and different points. Code which I am using to get the content length is specified below.

var data = Encoding.ASCII.GetBytes(requestBody); // requestBody is the JSON String
webReqeust.ContentLength = data.Length;

Is it mandatory to provide content length in REST API calls ?

Edit 1:

This is what my sample code looks like for web request

webReqeust = (HttpWebRequest)WebRequest.Create(string.Format("01", requestURI, queryString));
webReqeust.Method = RequestMethod.ToString();
webReqeust.Headers.Add("Authorization", string.Format("0 1", token_type, access_token)); 
webReqeust.Method = RequestMethod.ToString();
webReqeust.ContentType = "application/json";
var data = Encoding.ASCII.GetBytes(requestBody);
webReqeust.ContentLength = data.Length;
using (var streamWriter = new StreamWriter(webReqeust.GetRequestStream()))

 streamWriter.Write(requestBody);
 streamWriter.Flush();
 streamWriter.Close();

I would suggest maybe instead try using HttpClient as done in the linked post from mjwills here. You don't have to use content length, but it sounds like that is being enforced by the API and ultimately you are trying to post too much.

Otherwise the way I see it is that something is making the request body too large. Is it serialized input data which gets encoded into a byte array? If that is what is happening then perhaps the correct length requirements are not being enforced on the data that composes the request body, and I would suggest inspecting what goes on in the composition of the request body object itself.