https://bugzilla.wikimedia.org/show_bug.cgi?id=17537
Summary: Turn off zlib.output_compression for 304
Product: MediaWiki
Version: 1.15-svn
Platform: All
OS/Version: All
Status: NEW
Keywords: patch
Severity: normal
Priority: Normal
Component: General/Unknown
AssignedTo: wikibugs-l@lists.wikimedia.org
ReportedBy: edwardzy...@thewritingpot.com
Created an attachment (id=5824)
--> (https://bugzilla.wikimedia.org/attachment.cgi?id=5824)
Fixes bug
When PHP has zlib.output_compression enabled, it compresses all pages output,
regardless of their HTTP status code. Even empty pages get a ~13 byte empty
gzipped file tacked as their response. Unfortunately, for HTTP status code 304,
this is in direct violation of the specification; furthermore, if SSL and
Keep-Alive are enabled, Firefox gets sufficiently confused such as to post a
download page for the page immediately after the 304 with extra information
afterwards (it mixes up the packets).
I've attached a patch that fixes this bug by manually turning off
zlib.output_compression when a 304 is being sent. I am also coordinating with
PHP's maintainers to get this fixed upstream.
Relevant links:
https://bugzilla.mozilla.org/show_bug.cgi?id=363109 (bug for Firefox getting
confused by data after 304)
http://bugs.php.net/bug.php?id=42362 (bug for PHP not turning of
zlib.output_compression when there is empty output)
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