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HTTP Derivations of Web Request and Web Response

Posted By: Dhilip.R     Posted Date: April 25, 2011    Points:5   Category :.NET Framework
Hi, Exerts

Can anybody tell me the HTTP Derivations of Web Request and Web Response.

Responses
Author: Raji sivadas             
Posted Date: June 13, 2011     Points: 20   

WebRequest is the abstract base class for the .NET Framework's request/response model for accessing data from the Internet. An application that uses the request/response model can request data from the Internet in a protocol-agnostic manner, in which the application works with instances of the WebRequest class while protocol-specific descendant classes carry out the details of the request.

Requests are sent from an application to a particular URI, such as a Web page on a server. The URI determines the proper descendant class to create from a list of WebRequest descendants registered for the application. WebRequest descendants are typically registered to handle a specific protocol, such as HTTP or FTP, but can be registered to handle a request to a specific server or path on a server.



The WebResponse class is the abstract base class from which protocol-specific response classes are derived. Applications can participate in request and response transactions in a protocol-agnostic manner using instances of the WebResponse class while protocol-specific classes derived from WebResponse carry out the details of the request.

Client applications do not create WebResponse objects directly; they are created by calling the GetResponse method on a WebRequest instance.

Example:
======

using System;
using System.IO;
using System.Net;
using System.Text;

namespace Examples.System.Net
{
public class WebRequestGetExample
{
public static void Main ()
{
// Create a request for the URL.
WebRequest request = WebRequest.Create ("http://www.contoso.com/default.html");
// If required by the server, set the credentials.
request.Credentials = CredentialCache.DefaultCredentials;
// Get the response.
HttpWebResponse response = (HttpWebResponse)request.GetResponse ();
// Display the status.
Console.WriteLine (response.StatusDescription);
// Get the stream containing content returned by the server.
Stream dataStream = response.GetResponseStream ();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader (dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd ();
// Display the content.
Console.WriteLine (responseFromServer);
// Cleanup the streams and the response.
reader.Close ();
dataStream.Close ();
response.Close ();
}
}
}





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