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Bug #45234 Incorrect Content-Length header
Submitted: 2008-06-11 11:03 UTC Modified: 2008-10-27 05:23 UTC
From: kulakov74 at yandex dot ru Assigned:
Status: Closed Package: Zlib related
PHP Version: 5.2CVS-2008-06-11 (snap) OS: Linux
Private report: No CVE-ID: None
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 [2008-06-11 11:03 UTC] kulakov74 at yandex dot ru 
Description:
------------
Many pointed out to the problem that the Content-Length header may have incorrect value when using zlib.output_compression. This problem may have been fixed but not completely. When the compressed data fits within 8K Content-Length is sent by zlib after compression and hence the header (if present) is updated correctly, but when the compressed data is larger no Content-Length is sent by zlib and hence the value is not fixed. 8K is the default buffer size for zlib (mod_deflate) and is not configurable. Anyway, whatever the size of the buffer is, I think the initial Content-Length should be removed when zlib cannot determine the size of the compressed data in advance. 

The following bugs are related:
http://bugs.php.net/bug.php?id=28460
http://bugs.php.net/bug.php?id=22143
http://bugs.php.net/bug.php?id=24083

I guess many pages compress to more than 8K. 

Reproduce code:
---------------
$FileToSend="filename.txt";
header("Content-Length: ".filesize($FileToSend));
readfile($FileToSend);


Expected result:
----------------
Content-Length header with the right value or removed. 

Actual result:
--------------
Content-Length header with the same value I set. Note that the file that is sent should COMPRESS to more than 8K in order for this to show. It may be 25K and the problem will not show up.

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 [2008-10-23 12:29 UTC] jani@php.net 
Please try using this CVS snapshot:

  http://snaps.php.net/php5.2-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/
 [2008-10-23 13:07 UTC] kulakov74 at yandex dot ru 
I'm very sorry, I cannot go into the trouble of installing PHP, all I could was check the bug with PHP 5.2.6 where it still was found. 

phpinfo() output this: 

This is not the latest release definitely. 
The test script I used was this: 

<?
ob_start();
phpinfo();
$Html=substr(ob_get_clean(), 0, 240000);
header("Content-Length: ".strlen($Html));
echo($Html);
?>

If the number 240000 is changed to 24000 the header is fine (changed from 24000 to some 5K value), and if it not the header is not correct (remains 240000).
 [2008-10-23 18:45 UTC] kulakov74 at yandex dot ru 
The line "phpinfo() output this:" should be ignored.
 [2008-10-26 23:10 UTC] jani@php.net 
Assumed fixed then.
 [2008-10-27 05:23 UTC] kulakov74 at yandex dot ru 
Can't you check it yourself?! If you do then it is fixed.
 
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