NoIdea - 3:11 pm on Apr 20, 2013 (gmt 0)
But can I (server) send only 200 without returning any page? Then my server's load doesn't increase. And respond 403 may be issued later (or may be not, it depends..)
The thing rather simply can be made by means of PHP, but is it possible to make it on the Apache (or other webserver) level?