Question

Hy,
I am using HttpWebRequest in 10 concurent threads to download a list of images. I sorted the images after the hostName so each of this threads are getting an image from the same Hostname.

HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(url);
myReq.ServicePoint.ConnectionLimit = 10;
myReq.Timeout = 2000;
myReq.KeepAlive = true;

HttpWebResponse myResp = (HttpWebResponse )myReq.GetResponse();

After the program is running for a while I keep getting timeout exception.
My thoughts are that I get exception because maybe the Host server has some limitation regarding the concurent connections from the same user.

So how is a connection reused in .net ?
In my program each thread is creating a new connection to a hostname, or is reusing the existing one because of the KeepAlive property ??

Answer 1

It seems that the problem was some servers that were using http/1.0.
HttpWebRequest is using 100 Continue behaviour but the server doesn’t support it.

So i changed the property System.Net.ServicePointManager.Expect100Continue to false and then everything worked fine.