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Google likes the 'if modified since' header
Email This ArticleGoogle Guy has stated that Google recognizes the ‘if modified since’ header & encourages webmasters to use it. Here’s the webmasterworld post by Google Guy.
Leaving it out can lead to crawling problems.
Here is a forum thread worth reading.
And here is a great tutorial on HTTP status codes.
And here is what Google’s guidelines have to say.
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