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CGI Frequently Asked Questions
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Basic Questions
What 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 Scripts
What is HTTP (HyperText Transfer Protocol)?
What HTTP request headers can I use?
What Environment variables are available to my application?
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?
Applications: Is there an existing script to ...
Where to look for programs, scripts, and other resources?
Where to look for free scripts for my application?
Discussion group/bulletin board
CSCW/Groupware
Database
Is than a non-setuid script to allow users to change password?
Troubleshooting a CGI application
Are 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?
Why does my CGI stop working when my form data exceeds [n] Kb?
Further Reading
Other FAQs/collections
Reference Page
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