barcode generator visual basic 6 source code THE WEB PROGRAMMING ENVIRONMENT in Java

Creating QR-Code in Java THE WEB PROGRAMMING ENVIRONMENT

THE WEB PROGRAMMING ENVIRONMENT
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Sending the HTTP Request
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Once the socket connection is made, the Web browser writes an HTTP command to request the document A request has up to four parts The first part is the request line This consists of three tokens, separated by spaces: the request method, the request URI, and the HTTP version The following shows a typical request line:
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GET /mypathhtml HTTP/10
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In this example, the request method is GET, the URI is /mypathhtml, and the HTTP version is HTTP/10 The HTTP specification defines eight possible methods, shown in Table 3-1 Of all these methods, the vast majority of requests use either GET or POST These two methods are the only ones considered in this book The second token on the request line is the request Uniform Resource Identifier (URI) This is the URI of the document or other resource being requested For all practical purposes, this corresponds to the URL without the leading http:// and host name In the example of http://wwwmycompanycom/mypathhtml, the request URI is /mypathhtml
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GET HEAD POST PUT DELETE OPTIONS TRACE CONNECT
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A simple request to retrieve the resource identified in the URI The same as GET, except the server doesn t return the requested document The server only returns the status line and headers A request for the server to accept data that will be written to the client s output stream A request for the server to store the data in the request as the new contents of the specified URI A request for the server to delete the resource named in the URI A request for information about what request methods the server supports A request for the Web server to echo the HTTP request and its headers A documented but currently unimplemented method reserved for use with a tunneling proxy
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Table 3-1
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HTTP Request Methods
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The last token on the line is the HTTP version This indicates the highest level of the HTTP specification the client application understands The allowable values are HTTP/10 and HTTP/11 After the request line come any request headers These are key/value pairs, one pair per line, with the key and value separated by a colon (:) After the last request header is written, an empty line consisting of only a carriage return and line feed is sent This informs the server that no more headers follow Even if no headers exist, this empty line must be sent, so the server doesn t look for any more headers Request headers inform the server further about the identity and capabilities of the client Typical request headers might be User-Agent Accept Content-Length The vendor and version of the client A list of content types the client recognizes The number of bytes of data appended to the request
A complete list of request and response headers is found in Appendix C For HTTP POST requests, the request may include data You see later in 12 how POST data is used to transmit the values of HTML form fields If data is present, seeing both the Content-Type and Content-Length request headers used is common
Server Acceptance of the Request
When a client connects to the Web server s listening port, the server accepts the connection and handles the request In most cases, it does so by starting a thread to process the request, so it can continue to service new requests Handling the request means different things depending on the URI If the URI represents a static document, the server opens the document file and prepares to copy its contents back to the client If the URI is a program name, such as a CGI script, servlet, or JSP page, and the server is configured to handle such a request, the server prepares to invoke the program or process
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