Question

Those “fine” RFCs mandate from every RFC-client that they beware of not using more than 2 connections per host…

Microsoft implemented this in WebClient. I know that it can be turned off with

App.config:

<?xml version="1.0" encoding="utf-8" ?> 
<configuration> 
 <system.net> 
  <connectionManagement> 
   <add address="*" maxconnection="100" /> 
  </connectionManagement> 
 </system.net> 
</configuration> 

(found on http://social.msdn.microsoft.com/forums/en-US/netfxnetcom/thread/1f863f20-09f9-49a5-8eee-17a89b591007 )

But how can I do it programmatically?

Accordin to
http://msdn.microsoft.com/en-us/library/system.net.servicepointmanager.defaultconnectionlimit.aspx

“Changing the DefaultConnectionLimit property has no effect on existing
ServicePoint objects; it affects only ServicePoint objects that are
initialized after the change. If the value of this property has not been
set either directly or through configuration, the value defaults to the
constant DefaultPersistentConnectionLimit.”

I’d like best to configure the limit when I instanciate the WebClient, but just removing this sad limitation programmatically at the start of my programm would be fine, too.

The server I access is not a regular webserver in the internet, but under my control and in the local lan. I want to do API-calls, but I don’t use webservices or remoting

Answer 1

With some tips from here and elsewhere I managed to fix this in my application by overriding the WebClient class I was using:

class AwesomeWebClient : WebClient {
    protected override WebRequest GetWebRequest(Uri address) {
        HttpWebRequest req = (HttpWebRequest)base.GetWebRequest(address);
        req.ServicePoint.ConnectionLimit = 10;
        return (WebRequest)req;
    }
}