mod_rewrite - How do I check the HTTP_REFERER's QUERY_STRING?

Question

I am trying to write a redirect rule that says "If the HTTP_REFERER contains a certain QUERY_STRING, do this..."

In other words, I have this scenario:

HTTP_REFERER: http://www.example.com/admin.php?foo=bar

... and I would like to say, "If the HTTP_REFERER contains the QUERY_STRING 'foo=bar', do this..." Make sense? Lol

Maybe it's not even possible? I'm relatively new to mod_rewrite.

Answer 1

As it turns out, the QUERY_STRING is already a part of the HTTP_REFERER.

So the solution is simple:

RewriteCond %{HTTP_REFERER} !foo=bar

Answer 2

Try this RewriteCond:

RewriteCond %{HTTP_REFERER} ^[^?]+\?([^&]*&)*foo=bar(&.*)?$