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Google not using HTTP IF MODIFIED SINCE?

     
10:22 am on Feb 21, 2007 (gmt 0)

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I read somewhere that Google sends HTTP_IF_MODIFIED_SINCE if they already know about a page.

My pages are already known by Google and sometimes they send the header. But in 90% of the cases they dont.

Why could that be? I haven't added a single page in one year...

9:20 pm on Feb 21, 2007 (gmt 0)

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JAWAG, because the content changes due to dynamic elements that are invoked to create the page.