i figured you wanted to change "other" webserver's 404 error's so you would recieve another msg.
but you want to make your own apache server give a 404 error with a gif, in stead of the one you have now.
in that case, apache will do just fine, no need for squid (srr about that).
in apache, there is a line that set's what error message people get, and you can change it to any url (witch happens to be the .gif you want).|
(check /etc/httpd/httpd.conf, if not found, do "find / -name 'httpd.conf' to search for the configuration file)
i forgot exactly how the line looks like, but i'm sure that it's in the manual (type man apache)
otherwise, a more simple solution might be webmin.
as the name suggest, webmin is a web-based administration tool.
if set up correctly, it's secure, and mostly easy to use. perfect for learning how to run a server, or how to configure it.
it has a more easy way of setting any kind of error message to whatever you like.
i hope this helps.
Last edited by shorun; 06-01-2007 at 03:33 AM.