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I'd like to use document.referrer for an informal referrer check. Is this element cross browser compatible? Will any browser throw an error when trying to reference the document object?
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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.
strict-origin-when-cross-origin offers more privacy. With this policy, only the origin is sent in the Referer header of cross-origin requests. This prevents leaks of private data that may be accessible from other parts of the full URL such as the path and query string.
Change referer headers in Chrome To disable referer headers in Chrome, all you need to do is launch it with the –no-referrers flag on the end. Linux and Mac users can do this from a terminal. Windows users will need to edit the shortcut and add the flag manually.
Using HTTP_REFERER isn't reliable, its value is dependent on the HTTP Referer header sent by the browser or client application to the server and therefore can't be trusted because it can be manipulated. Regarding the Referer header, section 15.1.
The document.referrer property is described in the DOM spec:
http://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-95229140
So it should be supported cross-browser. However, you can easily detect if the implementation does support this property like
if( 'referrer' in document ) {
console.log(document.referrer);
}
You can not depend on it to determine if the request is coming from a browser (many non-browser robots also send one). While it is supported by browsers their are also privacy programs to specifically not provide it. Sometimes this is done by a proxy server ... http://en.wikipedia.org/wiki/HTTP_referrer ... and If a website is accessed from a HTTP Secure (HTTPS) connection and a link points to a non-secure connection, then the referrer field is not sent.
So the answer is yes but with exceptions.
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