FullUrl

This value, blank by default, can be used to specify the full URL of the UseModWiki main script. (i.e. http://yourdomain.com/cgi-bin/wiki.pl )

If you are receiving a 500 / Internal Server error after each attempt to save an edited page, check to see if the script is redirecting you to the wrong page. You can generally see where it is directing you by looking up in the URL bar of your browser. If it's redirecting you improperly, then $FullUrl may fix the problem.

For example, it may be directing you to the following address:

http://yourdomain.com/cgi-bin/?TopicYouJustEdited

In this case, the proper redirect address is as follows:

instead of http://yourdomain.com/cgi-bin/wiki.pl?TopicYouJustEdited

Setting your $RedirType to 3 may prevent the internal error, but does not solve the problem, as even the links on the non-redirect page are incorrect.