如何强制.NET打开许多同时进行的HTTP连接

Question

Here is the very simple scenario I would like to show:

internal class Program
{
    private static void Main(string[] args)
    {
        var uri = new Uri("http://myserver.com");
        ServicePointManager.FindServicePoint(uri).ConnectionLimit = 1000;
        for (int i = 0; i < 1000; i++)
        {
            WebRequest.Create(uri).BeginGetResponse(a => { }, null);
        }
        Console.WriteLine("done");
        Console.ReadLine();
    }
}

And corresponding App.config:

<system.net>
  <connectionManagement>
    <clear/>
    <add address="*" maxconnection="1000" />
  </connectionManagement>
  <defaultProxy>
    <proxy proxyaddress="http://127.0.0.1:8888" />
  </defaultProxy>
</system.net>

Let say myserver.com responds 10 seconds (I emulated this in Fiddler via AutoResponder).

In the proxy server (Fiddler) I see that only 14 http requests are sent at application start. Then number of active connections is growing but very slow, about +1 request in 1-2 sec. So after 1 minute of work the number of active http requests is about 50, but not 1000.

Is there any configuration that I can change to force .NET to open if not 1000 real http request but at least 200-300?

Answer 1

I think that the best solution is to open each of the connections in new Thread.

The thread limit is 1023 in .NET 4 32-bit systems 32768 in .NET 4 64-bit systems

If it doesn't work at least you will be sure that there is nothing wrong in your code.