Is it possible to set a custom header as part of a GET response from the server-side, and retrieve its value using JavaScript/JQuery on the client side once the response is received?
If so, what is the proper way of doing this in JavaScript?
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No, you can't. It would be a security vulnerability. Hence, you can only do it at server-side. Why would you need something like that? – Alexander Feb 17 '13 at 16:56
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If you're talking about an ajax request, you can use http://stackoverflow.com/a/4881836/1331430 – Fabrício Matté Feb 17 '13 at 17:08
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As mentioned in the comments to your question, the answer is no, not directly.
If you really need to do this, as a workaround you can push values as hidden fields if returning HTML, part of your response if returning JSON etc.
If you absolutely, unavoidably need to do this, you can make a separate HEAD XMLHTTPRequest to the desired page, and load the headers from there.
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