How would I go about blocking requests which try to exploit application / php flaws?

One in particular is ... of the form http://www.domain.com/search.php?searchterm=http://217.218.xxx.x/abc.php

I'd like to block all requests which have a param that begins with http:// (searchterm in the above case).

Can this be done at a server level?

Regards,
Shri



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