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CGI Programming FAQ.

CGI Programming FAQ CGI Programming FAQ

Copyright © Nick Kew, 1996-2000. Please read the Notice and Disclaimer.

The Table of contents starts at 0 (preamble). Older (pre-HTML 3) or broken browsers may start it at 1: apologies for any confusion. Table of Contents PreambleChangesNotice and DisclaimerWhere to get this documentHow to contribute to this document?Can I email the author my questions?What's up with posting to comp.infosystems.www.authoring.cgi?CreditsBasic QuestionsWhat is CGI?Is it a script or a program?When do I need to use CGI?Should I use CGI or JAVA?Should I use CGI or SSI or ... { PHP/ASP/... }Should I use CGI or an API?So what are in a nutshell the options for webserver programming?What do I absolutely need to know?Does CGI create new security risks?Do I need to be on Unix?Do I have to use Perl?What languages should I know/use?Do I have to put it in cgi-bin?Do I have to call it *.cgi? *.pl?What is the "CGI Overhead", and should I be worried about it?What do I need to know about file permissions and "chmod"?What is CGIWrap, and how does it affect my program?How do I decode the data in my Form?HTTP Headers and NPH ScriptsWhat is HTTP (HyperText Transfer Protocol)?What HTTP request headers can I use?What Environment variables are available to my application?Why doesn't my script get REMOTE_USER? My page is password-protected.What HTTP response headers do I need to know about?What is NPH?Must/should/can I write nph scripts?Do I have to call it nph-*What is the difference between GET and POST?Techniques: "How do I..."Can I get information about who is visiting?Can I get the email of visitors? "But I saw some.kool.site display my email address..."Can I verify the email addresses people enter in my Form?Subject: How can I get the hostname of the remote user?Can I get browser details and return different pages?Can I trace where a user has come from/is going to?Can I launch a long process and return a page before it's finished?Can I launch a long process which the user interacts with?Can I password-protect my pages?Can I do HTTP authentication using CGI?Can I identify users/sessions without password protection?Can I redirect users to another page?Can I run a CGI script without returning a new page to the browser?Can I write output to a different Netscape frame?Can I write output to several frames at once?Can I use a CGI script to generate both text and inline images?How can I use Caches to make CGI scripts faster and more Net-friendly?How can I avoid users hitting "submit" twice?How can I stop my CGI script reading and writing files as "nobody"?How can I prevent my CGI results being cached by the browser?How can I control the default filename when downloading a file via CGI?Troubleshooting a CGI applicationAre there some interactive debugging tools and services available?I'm having trouble with my headers. What can I do?Why do I get Error 500 ("the script misbehaved", or "Internal Server Error")I tried to use (Content-Type|Location|whatever), but it appears in my Browser?How can I run my CGI program 'live' in a debugger?I'm using CGI with QUERY_STRING embedded in my HTML, but it gets corrupted?Further ReadingOther FAQs/collectionsReference Pages

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