Description:
------------
I feel like the current behaviur of get_headers() is wrong, i.e. it doesnt give me the headers on 404 errors etc.

Would like to get the header, even thou its just an error header.

Reproduce code:
---------------
php -r 'print_r(get_headers("http://example.com/non"));'

Expected result:
----------------
Array
(
    [0] => HTTP/1.1 404 Not Found
    [1] => Date: Wed, 10 Aug 2005 00:47:07 GMT
    [2] => Server: Apache/1.3.27 (Unix)  (Red-Hat/Linux)
    [3] => Transfer-Encoding: chunked
    [4] => Connection: close
    [5] => Content-Type: text/html; charset=iso-8859-1
)

Actual result:
--------------
Warning: get_headers(http://example.com/non): failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found
 in Command line code on line 1