HttpWebRequest times out on second call

Question

Why does the following code Timeout the second (and subsequent) time it is run?

The code hangs at:

using (Stream objStream = request.GetResponse().Ge         


        

Answer 1

As you have stated, running fiddler in the background would mitigate the issue. This is because fiddler force closes any responses. Extending on the above post from Sam B I would ensure that the response is closed like so:

using (var wresponse = request.GetResponse())
{
   using (Stream objStream = wresponse.GetResponseStream())
   {
        // ...
   } 
   wresponse.close();
}

Also it may be worth setting the proxy to null like so:

 request.Proxy = Null;

As the .NET framework will go out searching for a proxy unless you explicitly do this. When fiddler is running this effect would be mitigated as fiddlers proxy would be found directly.

Answer 2

The WebResponse obtained by request.GetReponse() MUST be disposed properly. Try this (removing request.Abort() and GC.Collect() calls):

using (var wresponse = request.GetResponse())
{
   using (Stream objStream = wresponse.GetResponseStream())
   {
        // ...
   }
}

Edit: Since it still does not work, I suggest you to test this with an empty windows application. This way, you could isolate app.config problems or maximum concurrent calls per host* (are you using other webrequest object somewhere else in your application to this host; which webresponse are not disposed properly?).

Hope this solve your problem, I am out of ideas!

• See Jon Skeet's answer here.