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Are there any HTTP Headers I could use to grab the entire referrer URL using a webserver/server-side scripting? Including query string, et cetera?
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$_SERVER['HTTP_REFERER'] will give you the referrer page's URL if there exists any. If users use a bookmark or directly visit your site by manually typing in the URL, http_referer will be empty. Also if the users are posting to your page programatically (CURL) then they're not obliged to set the http_referer as well.
To check the Referer in action go to Inspect Element -> Network check the request header for Referer like below. Referer header is highlighted. Supported Browsers: The browsers are compatible with HTTP header Referer are listed below: Google Chrome.
$_SERVER['HTTP_REFERER'] Returns the complete URL of the current page (not reliable because not all user-agents support it) $_SERVER['HTTPS'] Is the script queried through a secure HTTP protocol.
To identify a URL parameter, refer to the portion of the URL that comes after a question mark (?). URL parameters are made of a key and a value, separated by an equal sign (=). Multiple parameters are each then separated by an ampersand (&).
You should be able to grab it from the $_SERVER['HTTP_REFERER'] variable.
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