Introduction to CGI Variables
If you come to Java servlets from traditional CGI, you are probably used to the idea of "CGI Variables".
These are a somewhat eclectic collection of information about the request.
Some are derived from the HTTP request line and headers (e.g. the part of the URI that came after the
question mark and typically contains the form data, or the Content-Length header), some are derived from
the socket itself (e.g. the name and IP address of the requesting host), and some are derived from server
installation parameters (e.g. the mapping of URLs to actual paths).
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This tutorial is now available as a book: Core Servlets and JavaServer Pages by Marty Hall, published by Sun Microsystems Press.
Read all about it at CoreServlets.com
Server-Side Web Applications using Java Servlets versions 2.1/2.2 and JavaServer Pages (JSP) version 1.0: A Tutorial
© 1999-2000 Marty Hall.
All source code freely available for unrestricted use.
Created for work in the Research and Technology Development Center of the Johns Hopkins University Applied Physics Lab, for courses in the Johns Hopkins Part-Time MS Program in Computer Science, and for various industry seminars and on-site Java short courses.
Please note that this is a first draft of the tutorial, so please send corrections, comments, and suggestions to me at hall@apl.jhu.edu.
Reprinted with permission from the author. Click here to visit the original version
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