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WebResponse encapsulates a response that is obtained as the result of a request WebResponse is an abstract class Inheriting classes create specific, concrete versions of it that support a protocol A WebResponse object is normally obtained by calling the GetResponse( ) method defined by WebRequest This object will be an instance of a concrete class derived from WebResponse that implements a specific protocol The methods defined by WebResponse that are most commonly used are shown in Table 25-3 The properties defined by WebResponse are shown in Table 25-4 The values of these properties are set based on each individual response WebResponse defines no public constructors
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HttpWebRequest and HttpWebResponse
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The classes HttpWebRequest and HttpWebResponse inherit the WebRequest and WebResponse classes and implement the HTTP protocol In the process, both add several properties that give you detailed information about an HTTP transaction Some of these
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Networking Through the Internet Using SystemNet
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Method public virtual void Close( )
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Description Closes the response It also closes the response stream returned by GetResponseStream( ) Returns an input stream connected to the requested URI Using this stream, data can be read from the URI
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public virtual Stream GetResponseStream( )
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TABLE 25-3
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Commonly Used Methods De ned by WebResponse
PART II
properties are used later in this chapter However, for simple Internet operations, you will not often need to use these extra capabilities
A Simple First Example
Internet access centers around WebRequest and WebResponse Before we examine the process in detail, it will be useful to see an example that illustrates the request/response approach to Internet access After you see these classes in action, it is easier to understand why they are organized as they are The following program performs a simple, yet very common, Internet operation It obtains the hypertext contained at a specific website In this case, the content of McGrawHillcom is obtained, but you can substitute any other website The program displays the
Property public virtual long ContentLength { get; set; }
Description Obtains or sets the length of the content being received This will be 1 if the content length is not available Obtains or sets a description of the content Obtains a collection of the headers associated with the URI If the response came from the cache, this property is true It is false if the response was delivered over the network If the client and server are both authenticated, then this property is true It is false otherwise Obtains the URI that generated the response This may differ from the one requested if the response was redirected to another URI
public virtual string ContentType { get; set; } public virtual WebHeaderCollection Headers { get; } public virtual bool IsFromCache { get; }
public virtual bool IsMutuallyAuthenticated { get; } public virtual Uri ResponseUri { get; }
TABLE 25-4
The Properties De ned by WebResponse
Part II:
Exploring the C# Library
hypertext on the screen in chunks of 400 characters, so you can see what is being received before it scrolls off the screen
// Access a website using System; using SystemNet; using SystemIO; class NetDemo { static void Main() { int ch; // First, create a WebRequest to a URI HttpWebRequest req = (HttpWebRequest) WebRequestCreate("http://wwwMcGraw-Hillcom"); // Next, send that request and return the response HttpWebResponse resp = (HttpWebResponse) reqGetResponse(); // From the response, obtain an input stream Stream istrm = respGetResponseStream();
/* Now, read and display the html present at the specified URI So you can see what is being displayed, the data is shown 400 characters at a time After each 400 characters are displayed, you must press ENTER to get the next 400 */ for(int i=1; ; i++) { ch = istrmReadByte(); if(ch == -1) break; ConsoleWrite((char) ch); if((i%400)==0) { ConsoleWrite("\nPress Enter"); ConsoleReadLine(); } } // Close the response This also closes istrm respClose(); } }
The first part of the output is shown here (Of course, over time this content will differ from that shown here)
<html> <head> <title>Home - The McGraw-Hill Companies</title> <meta name="keywords" content="McGraw-Hill Companies,McGraw-Hill, McGraw Hill, Aviation Week, BusinessWeek, Standard and Poor s, Standard & Poor s,CTB/Mc-
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