How to get response url in XMLHttpRequest?

The final URL (after following all redirects) is available in the responseURL attribute of a XMLHttpRequest instance.
This feature is new and only supported in Firefox 32 stable in September 2014 [ref] and Chrome 37.0.2031.0 stable in August 2014 [ref] (and probably also Opera 24). responseURL is not (yet) supported in IE 11 or Safari 7 and older browsers. For these browsers, the previous answer is still true:

XMLHttpRequest automatically follows redirects, without saving the served URLs in a property. The Location header can neither be retrieved through the .getResponseHeader().

References:

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