June 1999
Intermediate to advanced
540 pages
21h 39m
English
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Maintaining State
One of the first complications for any nontrivial CGI script is how to “maintain state.” Since HTTP is a stateless protocol, there’s no built-in mechanism for keeping track of requests from the server end. A CGI transaction involving multiple forms, therefore, needs to find a way to remember information supplied on previous forms. One way to deal with this issue is to use cookies, which allow the CGI program to save information on the browser’s end; but not all browsers support cookies, and some users are uncomfortable with the perceived privacy infringement associated with cookies.
CGI.pm simplifies maintaining state without cookies. When a CGI.pm script is called multiple times, the input fields are given default values from the previous invocation.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.