Expect: 100-continue

Question

There are a lot of questions on this topic, but - they gave me no answer.

As from advices - there is one to set ServicePointManager.Expect100Continue = false. But it is not acceptable because this will be a module, asynchroniously working along with dozen of others. So acceptable solution - is per-connection property. There are advices how to set this, but it doesn't seem to be working.

Here is the code:

var conuri = new Uri(connectionString);
var sp = ServicePointManager.FindServicePoint(conuri);
sp.Expect100Continue = false;

_request = (HttpWebRequest)WebRequest.Create(conuri);
_request.ContentType = "text/xml";
_request.Method = "POST";

_request.ContentLength = dataToSend.Length;
requestStream = _request.GetRequestStream();
requestStream.Write(dataToSend, 0, dataToSend.Length);

Problem is, that at the point "requestStream.Write" - header Expect: 100-continue is still added, but it shouldn't according to advice I've read here: C# Expect100Continue header request.

Answer 1

You can do it this way :

_request.ServicePoint.Expect100Continue = false;

This will disable the Expect: 100-continue for a particular HttpWebRequest instance.