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Bug #23753 ob_gzhandler and IE problem
Submitted: 2003-05-22 09:11 UTC Modified: 2003-05-27 14:51 UTC
Votes:2
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: admin at sportsandbytes dot de Assigned:
Status: Not a bug Package: Zlib related
PHP Version: 4.3.3-dev OS: redhat linux 7.2
Private report: No CVE-ID: None
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 [2003-05-22 09:11 UTC] admin at sportsandbytes dot de
Following Problem: 
 
After upgrading from apache1.3.26/php4.2.2 to apache1.3.27/php4.3.1 
we noticed a problem with 2 of our pages. 
 
Background: 
We use ob_gzhandler to compress pages, wich before the upgrade 
worked fine. After the upgrade 2 of several 100 pages didnt display in 
IE/win anymore. Problem disappears of ob_gzhandler is not used. 
Other Browsers (mozilla/konqui/ie on mac/safari) didnt show this 
problem. Subsequent downgrade made problem dissapear. 
 
switching to zlib_output_compression = on with set_ini() calls 
adjusting zlib.output_compression_level from within the script works 
fine too. 
 
the code in question goes like this 
               
	       . 
               . 
               . 
               //build $this->pageSource 
               . 
               . 
               . 
               ob_start("ob_gzhandler"); 
               echo $this->pageSource; 
               ob_end_flush(); 
 
 
Getting the afflicted pages with wget sending appropriate headers and 
such gives me a nicely compressed page. 
Uncompressing the downloaded page with gzip shows gzip 
complaining about 'trailing grabage' wich it ignores. 
The uncompressed page afterwards looks just like expected in IE. 
 
This leads me to the assumption that the 'trailing garbage' is the 
problem and does not in fact get ignored by IE 
 

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 [2003-05-22 12:55 UTC] camarcos at ache dot com dot br
Hello, my problem is equal....

Help-me too....

Marcos Chibly
camarcos@ache.com.br
 [2003-05-23 09:17 UTC] admin at sportsandbytes dot de
With http://snaps.php.net/php4-STABLE-latest.tar.gz 
instead of 4.3.1 Problem is not resolved 
 
additionally the 'workaround' of using 
zlib_output_compression via alter_ini() for 
zlib.output_compression_level from inside script doesent work 
anymore either
 [2003-05-23 09:23 UTC] admin at sportsandbytes dot de
Correction 
 
problem not fixed, 
 
BUT the zlib.output_compression_level thing of course still 
works 
must have messed up checking the first time around
 [2003-05-23 09:45 UTC] admin at sportsandbytes dot de
Additional Info: 
getting the affected page via wget again and unzipping with 
gunzip shows no problem with 'trailing garbage' anymore, but 
still IE/win does not display page when ob_gzhandler is used
 [2003-05-23 10:29 UTC] sniper@php.net
This works fine with any other browser?
What IE version is it? Have you tried older ones?
Are you absolutely sure that with older PHP but with the exactly same IE version this worked?

 [2003-05-26 09:59 UTC] admin at sportsandbytes dot de
Yes, it works fine with konqueror3.1, safari, mozilla, phoenix, ie/mac 
but not with ie/win 5.5 and 6, unfortunatly i dont have acess to 
anything older than 5.5 
 
it works fine with php4.2.2/apache1.3.26 but not with either 
1.3.27/4.3.1 or 1.3.27/4.3.3-dev 
 
while with 4.3.1 a affected page got with wget make gunzip complain 
about trailing grabage this does not happen with 4.3.3-dev 
but in both cases IE will not display the affected pages. 
 
if you like i can set up an affected instance on a public IP for you to 
look at
 [2003-05-27 03:15 UTC] sniper@php.net
Please put that page up somewhere..

 [2003-05-27 14:51 UTC] sniper@php.net
This is really an IE bug, see for example this:

http://lists.over.net/pipermail/mod_gzip/2002-October/006587.html

Also, zlib.output_compression is the preferred way to handle
this in PHP anyway..

 
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