Accessing the web page's HTTP Headers in JavaScript

Question

How do I access a page\'s HTTP response headers via JavaScript?

Related to this question, which was modified to ask about accessing two specific HTTP headers.

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Answer 1

This is an old question. Not sure when support became more broad, but getAllResponseHeaders() and getResponseHeader() appear to now be fairly standard: http://www.w3schools.com/xml/dom_http.asp