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Fundamental to Internet programming is the Uniform Resource Identifier (URI) A URI describes the location of some resource on the network A URI is also commonly called a URL, which is short for Uniform Resource Locator Because Microsoft uses the term URI when describing the members of SystemNet, this book will do so, too You are no doubt familiar with URIs because you use one every time you enter an address into your Internet browser A URI has the following simplified general form: Protocol://HostName/FilePath Query Protocol specifies the protocol being used, such as HTTP HostName identifies a specific server, such as mhprofessionalcom or wwwHerbSchildtcom FilePath specifies the path to a specific file If FilePath is not specified, the default page at the specified HostName is obtained Finally, Query specifies information that will be sent to the server Query is optional In C#, URIs are encapsulated by the Uri class, which is examined later in this chapter

Part II:

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The classes contained in SystemNet support a request/response model of Internet interaction In this approach, your program, which is the client, requests information from the server and then waits for the response For example, as a request, your program might send to the server the URI of some website The response that you will receive is the hypertext associated with that URI This request/response approach is both convenient and simple to use because most of the details are handled for you The hierarchy of classes topped by WebRequest and WebResponse implement what Microsoft calls pluggable protocols As most readers know, there are several different types of network communication protocols The most common for Internet use is HyperText Transfer Protocol (HTTP) Another is File Transfer Protocol (FTP) When a URI is constructed, the prefix of the URI specifies the protocol For example, http://wwwHerbSchildtcom uses the prefix http, which specifies hypertext transfer protocol As mentioned earlier, WebRequest and WebResponse are abstract classes that define the general request/response operations that are common to all protocols From them are derived concrete classes that implement specific protocols Derived classes register themselves, using the static method RegisterPrefix( ), which is defined by WebRequest When you create a WebRequest object, the protocol specified by the URI s prefix will automatically be used, if it is available The advantage of this pluggable approach is that most of your code remains the same no matter what type of protocol you are using The NET runtime defines the HTTP, HTTPS, file, and FTP protocols Thus, if you specify a URI that uses the HTTP prefix, you will automatically receive the HTTP-compatible class that supports it If you specify a URI that uses the FTP prefix, you will automatically receive the FTP-compatible class that supports it Because HTTP is the most commonly used protocol, it is the only one discussed in this chapter (The same techniques, however, will apply to all supported protocols) The classes that support HTTP are HttpWebRequest and HttpWebResponse These classes inherit WebRequest and WebResponse and add several members of their own, which apply to the HTTP protocol SystemNet supports both synchronous and asynchronous communication For many Internet uses, synchronous transactions are the best choice because they are easy to use With synchronous communications, your program sends a request and then waits until the response is received For some types of high-performance applications, asynchronous communication is better Using the asynchronous approach, your program can continue processing while waiting for information to be transferred However, asynchronous communications are more difficult to implement Furthermore, not all programs benefit from an asynchronous approach For example, often when information is needed from the Internet, there is nothing to do until the information is received In cases like this, the potential gains from the asynchronous approach are not realized Because synchronous.

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Internet access is both easier to use and more universally applicable, it is the only type examined in this chapter Since WebRequest and WebResponse are at the heart of SystemNet, they will be examined next