Where and when exactly a request does takes place to a particular http/s url?

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C#

ASP.NET

Thank you all.

Let me get wider it more. I set up some properties and send some messages.
Here how I tried to do the client side, but this doesn't work, it retuns different exceptions.
The server side is secured. It is actually a servlet runs on Tomcat.

X509Certificate cert = X509Certificate.CreateFromCertFile(@"servlet.cer");

ServicePointManager.ServerCertificateValidationCallback =
                new System.Net.Security.RemoteCertificateValidationCallback(OnCertificateValidation); // always true

request.ClientCertificates.Add(cert);
request.ContentType = "text/text";

CredentialCache myCache = new CredentialCache();
myCache.Add(new Uri(url), "Basic", new NetworkCredential("userID", "password")); 

request.Credentials = myCache;

writer.WriteLine("Why this doesn't work as I wished?");
return;

Hallo Everybody,

Where and when exactly a request does takes place to a particular http/s url?
Here I put sample code:
And this works well.

StreamWriter writer;
StreamReader reader;

string Url = "http://localhost:1212/TestPage";

WebRequest request = WebRequest.create(Url); // ---1--- here or
request.Method = "POST";

writer = new StreamWriter(request.GetRequestStream()); // ---2--- here

WebResponse response = request.GetResponse();

reader = new StreamReader(response.GetResponseStream());

writer.Close();
rsp.Close();
req.GetRequestStream().Close();

return;