Req #51579 [Opn->Fbk]: ob_gzhandler/header("304") incompatibility
Edit report at https://bugs.php.net/bug.php?id=51579&edit=1
ID: 51579
Updated by: mike@php.net
Reported by: boris at povolnam dot ru
Summary: ob_gzhandler/header("304") incompatibility
-Status: Open
+Status: Feedback
Type: Feature/Change Request
Package: Unknown/Other Function
Operating System: irrelevant
PHP Version: 5.2.13
-Assigned To:
+Assigned To: mike
Block user comment: N
Private report: N
New Comment:
Please try a newer PHP version, though, usually, your web server should prevent sending a body with
304 responses.
Previous Comments:
------------------------------------------------------------------------
[2010-12-10 16:36:30] roan dot kattouw at gmail dot com
Clarification: the HTTP spec requires 304 responses be empty, and Firefox is very particular about
that. But ob_gzhandler gzips even empty responses, and gzipping the empty string does not return the
empty string (GZIP header, at least).
Proposed solution: if there was no output (empty buffer), do not compress and do not send
Content-Encoding:gzip
------------------------------------------------------------------------
[2010-04-17 01:22:02] boris at povolnam dot ru
Description:
------------
test script below will produce a response with not empty body (it will contain gzip stream header)
which breaks the W3C standart that requires 304 response to have empty body.
The idea was to speed up things with compression and leveraging client side caching, but end up
firefox (v.3.6.3) prepending with that body some of conseqent responces (css file in my case, which
broken styles rendering - that was really really hard to find - i just coudn't understand why
my server returns corrupted file and only to firefox)
Test script:
---------------
<?php
ob_start("ob_gzhandler");
header('HTTP/1.1 304 Not Modified');
ob_end_flush();
?>
Expected result:
----------------
ob_gzhandler() to look into response headers and wipe out buffer and disable compression if 304 is
set. Cause it's a subtle thing about 304 header, its body and the way ob_gzhandler() works and
others can run into same problem while trying to speed up website as compression and client-side
caching are 2 main things to do.
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=51579&edit=1
Thread (4 messages)