Last modified: 2012-11-03 08:39:05 UTC

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Bug 9997 - Export function doesn't work with apache modul mod_gzip
Export function doesn't work with apache modul mod_gzip
Status: NEW
Product: MediaWiki
Classification: Unclassified
Export/Import (Other open bugs)
All All
: Low normal (vote)
: ---
Assigned To: Nobody - You can work on this!
Depends on:
  Show dependency treegraph
Reported: 2007-05-21 22:06 UTC by Andreas Hubel
Modified: 2012-11-03 08:39 UTC (History)
1 user (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---


Description Andreas Hubel 2007-05-21 22:06:26 UTC
It looks like the export function doesn't create a right encoding header, so mod_gzip doesn't recognise it as already gziped and gzip it again. The result is a non readable text, because browsers only unzip once.

The produced encoding header looks like this: 
 Content-Encoding: , gzip 

At the moment I only found a workaround by commenting some parts in includes/GlobalFunctions.php:

function wfResetOutputBuffers( $resetGzipEncoding=true ) {
        while( $status = ob_get_status() ) {
                if( $status['type'] == 0 /* PHP_OUTPUT_HANDLER_INTERNAL */ ) {
                        echo 'status 0';
                        // Probably from zlib.output_compression or other
                        // PHP-internal setting which can't be removed.
                        // Give up, and hope the result doesn't break
                        // output behavior.
/* Commented because of encoding errors 
               if( !ob_end_clean() ) {
                        // Could not remove output buffer handler; abort now
                        // to avoid getting in some kind of infinite loop.

                if( $resetGzipEncoding ) {
                        if( $status['name'] == 'ob_gzhandler' ) {
                                // Reset the 'Content-Encoding' field set by this handler
                                // so we can start fresh.
                                header( 'Content-Encoding:' );
Comment 1 Andreas Hubel 2007-05-21 22:09:56 UTC
I forgot: 
This bug was first in subversion revison 15101 (between Release 1.6 and 1.7) as gzip compression was introduced for exports.
Comment 2 Brion Vibber 2007-05-22 14:07:27 UTC
(If possible, please provide Apache version and the configuration of mod_gzip.)

We try to disable buffering (and hence PHP-level compression) on Special:Export so a long export job won't eat too much buffered memory... not 100% sure if that's the best thing though. Looks like there's some weird combination of things on your setup and it's not resetting correctly.
Comment 3 Siebrand Mazeland 2008-08-18 18:47:36 UTC
Mass compoment change: <some> -> Export/Import

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