In the Hypertext Transfer Protocol (HTTP), HTTP header fields contain the operating parameters of an HTTP request or response. With the request or response line (first line of message), they form the message header.

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How to get keywords from Google HTTP referrer?

Can the http referrer URL from Google be decoded so that I can see the specific keywords? ...
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Can serving a different header code for crawlers and users be considered cloaking?

I have urls that point to pages I don't know yet if exist. Whenever reaching those, I perform a not-so-quick external sources check, and if exists generate the page on the fly. In order to avoid this ...