enigma1 - 8:39 pm on Jul 30, 2009 (gmt 0)

Bill, it won't apply to spiders. Thats only for whoever wants to enter the site as a human (basic UA check for http or spiders whitelist). But for humans it will apply to all pages the first time not just the home page.

Yes sessions are already used to post forms, create accounts etc, otherwise you only view pages.

But the thing is spiders will go through without scrutiny while humans the first time will have to click the button. I can set it up to use an ip or a cookie as signature for sometime so this won't be repeated for subsequent accesses.

This approach I don't know if it will cause spiders to detriment the value of the site or even remove it from their index.