C# 0 The Complete Reference

PART II

C h a p t e r   2 5 :  

N e t w o r k i n g   T h r o u g h   t h e   I n t e r n e t   U s i n g   S y s t e m . N e t    

835

The following program displays headers associated with McGraw-Hill.com:

// Examine the headers.

using System;

using System.Net;

Property

Description

public string CharacterSet { get; }

Obtains the name of the character set being used.

public string ContentEncoding { get; }

Obtains the name of the encoding scheme.

public long ContentLength { get; }

Obtains the length of the content being received. This 

will be –1 if the content length is not available.

public string ContentType { get; }

Obtains a description of the content.

public CookieCollection

     Cookies { get; set; } 

Obtains or sets a list of the cookies attached to the 

response.

public WebHeaderCollection

    Headers{ get; }

Obtains a collection of the headers attached to the 

response.

public bool IsFromCache { get; }

If the response came from the cache, this proper ty is 

true. It is false if the response was delivered over the 

network.

public bool

    IsMutuallyAuthenticated { get; }

If the client and ser ver are both authenticated, then 

this proper ty is true. It is false other wise. 

public DateTime LastModified { get; }

Obtains the time at which the resource was last 

changed.

public string Method { get; }

Obtains a string that specifies the response method.

public Version ProtocolVersion { get; }

Obtains a 

Version

 object that describes the version of 

HTTP used in the transaction.

public Uri ReponseUri { get; }

Obtains the URI that generated the response. This 

may differ from the one requested if the response 

was redirected to another URI.

public string Ser ver { get; }

Obtains a string that represents the name of the 

ser ver.

public HttpStatusCode StatusCode { get; }

Obtains an 

HttpStatusCode

 object that describes the 

status of the transaction.

public string StatusDescription { get; }

Obtains a string that represents the status of the 

transaction in a human-readable form.

T

ABLE

 25-5 

The Proper ties Defi ned by 

HttpWebResponse

www.freepdf-books.com

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836

 

P a r t   I I :  

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class HeaderDemo {

  static void Main() {

    // Create a WebRequest to a URI.

    HttpWebRequest req = (HttpWebRequest)

           WebRequest.Create("http://www.McGraw-Hill.com");

    // Send that request and return the response.

    HttpWebResponse resp = (HttpWebResponse)

           req.GetResponse();

    // Obtain a list of the names.

    string[] names = resp.Headers.AllKeys;

    // Display the header name/value pairs.

    Console.WriteLine("{0,-20}{1}\n", "Name", "Value");

    foreach(string n in names) {

      Console.Write("{0,-20}", n);

      foreach(string v in resp.Headers.GetValues(n))

        Console.WriteLine(v);

    }

    // Close the response.

    resp.Close();

  }

}

Here is the output that was produced. (Remember, all header information is subject to 

change, so the precise output that you see may differ.)

Name                Value

Transfer-encoding   chunked

Content-Type        text/html

Date                Fri, 27 Jun 2008 20:32:06 GMT

Server              Sun-ONE-Web-Server/6.1