问题
When requesting header data using HEAD method with CORS object, it returns null.
getAllResponseHeaders() -> return null.
How to setup php headers in the other site so that I can retrieve header data>
p.s.: this is not within the same domain. it's a cross origin resource sharing
Thank you
回答1:
I've noticed this behavior in Firefox (3.6.13); getAllResponseHeaders() returns nothing. In Chrome/Safari, getAllResponseHeaders() only returns simple response headers (as defined in the spec http://www.w3.org/TR/cors/#terminology). None of these browsers respect the Access-Control-Expose-Headers header.
回答2:
Since the last answer to this question, modern browsers respect the Access-Control-Expose-Headers header.
This bug is fixed in up to date versions of IE (11) and Chrome (43) and Firefox (39).
来源：https://stackoverflow.com/questions/4561221/cors-xmlhttprequest-head-method