The WebRequest.RegisterPrefix(string, IWebRequestCreate) method registers System.Net.WebRequest descendants to service requests. System.Net.WebRequest descendants are typically registered to handle a specific protocol, such HTTP or FTP, but can be registered to handle a request to a specific server or path on a server.

The pre-registered reserve types already registered include the following:

• http://

• https://

• ftp://

• file://

For more information, see the WebRequest.Create(string) and WebRequest.Create(Uri) methods.

Duplicate prefixes are not allowed. WebRequest.RegisterPrefix(string, IWebRequestCreate) returns false if an attempt is made to register a duplicate prefix.

The following example demonstrates how to register a new scheme.

using System;
using System.Net;

public class ftpWebRequest : WebRequest {
   //implement ftp-specific protocol methods and properties
}

public class ftpCreator : IWebRequestCreate 
{
   public WebRequest Create(Uri uri) 
   {
      return new ftpWebRequest(); 
   }
}

public class RegisterPrefixExample
{

   public static void Main() 
   {
 
      ftpCreator creator = new ftpCreator();
      WebRequest.RegisterPrefix("ftp://", creator);
      WebRequest wr = WebRequest.Create("ftp://testFile");
      Console.WriteLine(wr);
   }
}
   

The output is

ftpWebRequest