Bug #55063 [Nab]: Additional headers are ignored when returning HTTP status 304

Edit report at https://bugs.php.net/bug.php?id=55063&edit=1 ID: 55063 Updated by: mike@php.net Reported by: evert at rooftopsolutions dot nl Summary: Additional headers are ignored when returning HTTP status 304 Status: Not a bug Type: Bug Package: Apache2 related Operating System: Any PHP Version: 5.3.6 Block user comment: N Private report: N New Comment: Sorry for the blurb; note to self: avoid the quick-fix dropdown. Previous Comments: ------------------------------------------------------------------------ [2015-07-16 08:09:27] mike@php.net Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Due to the volume of reports we can not explain in detail here why your report is not a bug. The support channels will be able to provide an explanation for you. Thank you for your interest in PHP. Apache will only send the following header fields on 304: "Connection", "Keep-Alive", "ETag", "Content-Location", "Expires", "Cache-Control", "Vary", "Warning", "WWW-Authenticate", "Proxy-Authenticate", "Set-Cookie", "Set-Cookie2", See https://github.com/apache/httpd/blob/2.4.x/modules/http/http_filters.c#L1332 ------------------------------------------------------------------------ [2011-06-29 05:56:33] evert at rooftopsolutions dot nl Description: ------------ When HTTP status 304 is set, Apache appears to ignore any other headers. X- Powered-By is also missing, which was the first hint that something was up in either the SAPI or Apache. I'm not fully sure this is a PHP bug, or an Apache bug though, so feel free to close it if I put it in the wrong space. The practical use-case I have for this is the so-called CORS headers. When I do a cross-domain request within firefox, and CORS headers have expired firefox requires them to be set, even for the 304 response. Since they get stripped, firefox just throws an error. Test script: --------------- header('HTTP/1.1 304 Not Modified') header('X-Foo: Bar'); Expected result: ---------------- The X-Foo header returned Actual result: -------------- All custom headers are ignored ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=55063&edit=1