Copying Http Request InputStream

Question

Hi,

I'm implementing a proxy action method that forwards the incoming web request and forwards it to another web page, adding a few headers. The action method works file for GET requests, but I'm still struggling with forwarding the incoming POST request.

The problem is that I don't know how to properly write the request body to the outgoing HTTP request stream.

Here's a shortened version of what I've got so far:

//the incoming request stream
var requestStream=HttpContext.Current.Request.InputStream;
//the outgoing web request
var webRequest = (HttpWebRequest)WebRequest.Create(url);
...

//copy incoming request body to outgoing request
if (requestStream != null && requestStream.Length>0)
            {
                long length = requestStream.Length;
                webRequest.ContentLength = length;
                requestStream.CopyTo(webRequest.GetRequestStream())                    
            }

//THE NEXT LINE THROWS A ProtocolViolationException
 using (HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse())
                {
                    ...
                }

As soon as I call GetResponse on the outgoing http request, I get the following exception:

ProtocolViolationException: You must write ContentLength bytes to the request stream before calling [Begin]GetResponse.

I don't understand why this is happening, since requestStream.CopyTo should have taken care of writing the right amount of bytes.

Any suggestions would be greatly appreciated.

Thanks,

Adrian

Answer 1

try modifying the block inside if statement

long length = requestStream.Length;
webRequest.ContentLength = length;
requestStream.CopyTo(webRequest.GetRequestStream())

with

webRequest.Method = "POST";
webRequest.ContentLength = requestStream.Length;
webRequest.ContentType = "application/x-www-form-urlencoded";
Stream stream = webRequest.GetRequestStream();
requestStream.CopyTo(stream);
stream.Close();