POST Request Method in Java

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9133 POST Request Method
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One of the great advantages of the Web is that Web sites can be interactive The earliest form of interactivity came in the form of CGI scripts, written in languages such as Perl CGI is an acronym for the Common Gateway Interface, which defines a standard mechanism for communicating data from browser to server CGI scripts, and later, server-side applications such as Java servlets (discussed in 10) and Active Server Pages (a proprietary Microsoft technology), make it possible for users to interact with server-side applications However, there must be a way for the browser to pass information from the user to the Web server This is where the Common Gateway Interface comes in CGI parameters are used for this purpose While it is possible to use the GET request to encode such parameters, limitations on the length of a URL are restrictive A better way is to use the POST method, which allows clients to send much more information (including large files) to server-side scripts and applications The POST request method has a format similar to a GET request After header fields have been sent, however, the client sends an entity body, which contains CGI parameters and other information When the entity body is complete, the server will process the information and output an HTTP response Table 9-2 gives a sample transaction, in which a browser submits information from an HTML form using the POST request method 9134 Client Request Header Fields Attached to any request may be header information and a number of optional fields Header fields are sent after the request line, and are terminated with a carriage return/linefeed If no headers are specified, the carriage return/linefeed must still be sent The HTTP specification defines several header fields that can be used, and clients are free to add their own However, not every server will honor such fields If a field is not supported, it will be ignored no error condition should be generated The major fields a client is likely to use are covered below Table 9-2 POST Request Sending Data to a Server POST /cgi-bin/informationpl HTTP/10 Client HTTP POST request Content-type: application/x-www-form Header (composed of several -urlencoded fields)
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Content-length: 21 User-Agent: SomeBrowser/10 Name=David%20Reilly&answer=yes
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HTTP/10 200 OK Last-Modified: Monday, 27-Dec-99 22:14 GMT Content-Type: text/html Content-Length: 4855 <HTML> <HEAD> <TITLE> Thanks for your feedback </TITLE> </HEAD> <BODY> </BODY> </HTML>
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// BODY GOES HERE
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Persistent client-side objects (cookies) are small pieces of data sent by a Web server and echoed back on every subsequent request Cookies are used for tracking client requests and customizing server output for individual users Not every client supports cookies, and cookie support can be disabled for privacy and security in most clients An example of this field is:
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Cookie: secret_id=553235996
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"From" Field The "From" field specifies the e-mail address of the user in control of the client Most Web browsers do not divulge this information (much to the dismay of direct-mail marketers); however, specialized or experimental HTTP clients may For example, a search engine that sends out requests to remote Web sites may include a contact e-mail address, to help establish contact if the search engine runs wild and requests too many pages in a given period An example of this field is:
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From: myemail@mydomaincom
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"If-Modified-Since" Field A client that has already requested a resource can use this header field to check whether the resource has been updated For example, a Web browser that caches pages may send the "IfModified-Since" field, specifying the date when the resource was last requested If the resource has been updated, the server will output a normal response and a normal entity body If, however, it has not been updated, the server will issue a response with a status code of 304 and no entity body The client then knows to use the cached version An example of this field is:
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