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TCP port 80 for communication)The client sends a request for a particular file,and receives an HTTP response,which will often include the contents of the file,as shown in Figure 91 The response includes a status code (indicating the success or failure of a request),some HTTP header information such as the length of the content and its type,and,if appropriate,the file contentsEach request is for a single file;if subsequent files are needed,additional connections must be made To understand what type of communication takes place between an HTTP client and a Web server, let's look at a sample transaction in which a browser fetches a Web page (see Table 9-1) Highlighted in bold font is the client request; the server sends the remainder of the transaction To fetch the file indexhtml in the root directory of a Web server, an HTTP client establishes a TCP connection to port 80 and makes an HTTP request The server processes the request and outputs an HTTP response Don't be concerned if the meaning of each part of the request and response is not clear to you at this point The client request and server response are described later in the chapter; for now it is simply important to be aware of what a simple HTTP request/response looks like
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A Web client, connecting to the Web server via a TCP socket, will send an HTTP request and then read back a server response Earlier versions of HTTP used a simple request format, which would only fetch a resource from the server Under HTTP/10, which most, if not all, servers and clients now support, there are three types of requests that a client application can issue to a Web server:
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1 GET 2 HEAD 3 POST The most common HTTP request is a GET request, which fetches a resource from the Web server More sophisticated requests are possible with HEAD and POST Each request can also include header fields, which give the server more information about the client 9131 GET Request Method When a client needs to retrieve a resource from a Web server, it uses the GET request The GET request takes two parameters: the pathname of the resource and the version of HTTP being used For example:
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GET /indexhtml HTTP/10 GET /images/bannergif HTTP/10 GET /linkshtml HTTP/10
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NOTE CGI parameters can also be passed using the GET method While often only files are requested, it is possible to invoke a CGI script or server-side application
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There are two major variations on the GET request, depending on which protocol version of HTTP is in use The most commonly used version by clients is HTTP/10, but servers must maintain backward compatibility with the earlier HTTP/09 To issue the older-style request, no HTTP version is specified
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GET /indexhtml GET /images/adservercgi
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When this style of request is made, no header fields will be returned in the HTTP response This type of request is rare, and clients should use the HTTP/10 version if at all possible 9132 HEAD Request Method Sometimes a client will be interested in information about a resource but not the resource itself For example, if a large file is already cached, the client may want to know if it has been modified recently If so, a new copy would be downloaded, and if not, the cached version would be used Some clients may be unable to process certain types of content, so they may want to know the MIME content type of the resource In these situations, a HEAD request can be made The HEAD request takes the same parameters as a GET request, and will return a normal HTTP response with information about the resource stored in header fields However, no actual content will be returned, conserving network bandwidth An example of a HEAD request is as follows:
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HEAD /files/averybigfilezip HTTP/10
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