09-26-2012
First, know CGI - a contract between a service executable and the web server. CGI must exit 0, must write part of the http response to stdout, gets Get form input in an environment variable encoded, other env variables tell about the socket, and POST input has to be read from stdin and decoded per the information in the environment. I think stderr goes into a log file. Input data can be in many different MIME formats. Output can be in almost any MIME format, e.g., text/html, text/plain, etc. You can write a CGI service in any language, but PERL scripting was an early leader.
PERL has modules to deal with CGI inputs and to help write output, but you must know HTTP and HTML to create valid and effective documents. And of course, you need to know about application specific challenges like creating PDF output if desired.
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......
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LEARN ABOUT DEBIAN
template::plugin::cgi
Template::Plugin::CGI(3pm) User Contributed Perl Documentation Template::Plugin::CGI(3pm)
NAME
Template::Plugin::CGI - Interface to the CGI module
SYNOPSIS
[% USE CGI %]
[% CGI.param('parameter') %]
[% USE things = CGI %]
[% things.param('name') %]
# see CGI docs for other methods provided by the CGI object
DESCRIPTION
This is a very simple Template Toolkit Plugin interface to the "CGI" module. A "CGI" object will be instantiated via the following
directive:
[% USE CGI %]
"CGI" methods may then be called as follows:
[% CGI.header %]
[% CGI.param('parameter') %]
An alias can be used to provide an alternate name by which the object should be identified.
[% USE mycgi = CGI %]
[% mycgi.start_form %]
[% mycgi.popup_menu({ Name => 'Color'
Values => [ 'Green' 'Black' 'Brown' ] }) %]
Parenthesised parameters to the "USE" directive will be passed to the plugin constructor:
[% USE cgiprm = CGI('uid=abw&name=Andy+Wardley') %]
[% cgiprm.param('uid') %]
METHODS
In addition to all the methods supported by the "CGI" module, this plugin defines the following.
params()
This method returns a reference to a hash of all the "CGI" parameters. Any parameters that have multiple values will be returned as lists.
[% USE CGI('user=abw&item=foo&item=bar') %]
[% CGI.params.user %] # abw
[% CGI.params.item.join(', ') %] # foo, bar
AUTHOR
Andy Wardley <abw@wardley.org> <http://wardley.org/>
COPYRIGHT
Copyright (C) 1996-2007 Andy Wardley. All Rights Reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
Template::Plugin, CGI
perl v5.14.2 2011-12-20 Template::Plugin::CGI(3pm)