Description:
------------
I've noticed numerous times that certain headers produced by PHP scripts are duplicated. Another problem is that the Content-Length header is set in code, but is missing in the output.

See below the expected and actual responses. Actual response discards the Content-Length header and duplicates the Content-Disposition header.

I sent this request to the PHP script to test it:

HEAD /download.php/458/Cats_in_the_Cradle.mid HTTP/1.1
Host: wapxtc.nl
accept-language: nl
user-agent: SonyEricssonT230/R101
cache-control: no-cache
accept: text/vnd.wap.wml,text/vnd.wap.wmlscript,*/*;q=0.001
accept-charset: us-ascii,iso-8859-1,utf-8,iso-10646-ucs-2,*;q=0.001
accept-encoding: *;q=0.001


FYI: I'm running Apache 2 (stable) on PHP5.02 (stable) on Linux.


Reproduce code:
---------------
// $data contains blob
header('Content-Length: ' . strlen($data));
header('Content-Type: ' . $item['MIMETYPE']);
header('Content-Disposition: inline; filename="' . $filename . '"');


// This outputs the 3 lines above in the error_log as expected:
error_log(implode("\n",headers_list()));


if ($_SERVER['REQUEST_METHOD'] != 'HEAD') {
  print $data;
}
exit;





Expected result:
----------------
HTTP/1.1 200 OK
Content-Disposition: inline; filename="Cats_in_the_Cradle.mid"
Last-Modified: Mon, 18 Oct 2004 13:23:52 GMT
Content-Type: audio/midi
Content-Length: 6331

Actual result:
--------------
HTTP/1.1 200 OK
Content-Disposition: inline; filename="Cats_in_the_Cradle.mid"
Last-Modified: Mon, 18 Oct 2004 13:23:52 GMT
Content-Type: audio/midi
Content-Disposition: inline; filename="Cats_in_the_Cradle.mid"