C# 0 The Complete Reference

Accessing Additional HTTP Response Information

When using 

HttpWebResponse

, you have access to information other than the content of 

the specified resource. This information includes such things as the time the resource was 

last modified and the name of the server, and is available through various properties 

associated with the response. These properties, which include the six defined by 

WebResponse

, are shown in Table 25-5. The following sections illustrate how to use 

representative samples.

Accessing the Header

You can access the header information associated with an HTTP response through the 

Headers

 property defined by 

HttpWebResponse

. It is shown here:

public WebHeaderCollection Headers{ get; }

An HTTP header consists of pairs of names and values represented as strings. Each name/

value pair is stored in a 

WebHeaderCollection

. This specialized collection stores key/value 

pairs and can be used like any other collection. (See Chapter 24.) A 

string

 array of the names 

can be obtained from the 

AllKeys

 property. You can obtain the values associated with a 

name by calling the 

GetValues( )

 method. It returns an array of strings that contains the 

values associated with the header passed as an argument. 

GetValues( )

 is overloaded to 

accept a numeric index or the name of the header.

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