PHP "Content-Encoding: gzip" in ispconfig web — how?

Hi folks

I just came across a weird behavior — I don't seem to be able using the PHP

PHP:

ob_start("ob_gzhandler");

for compressing the output.

When throwing in a file like

PHP:

<?php
ob_start("ob_gzhandler");
phpinfo();
?>

in

Code:

/home/admispconfig/ispconfig/web/test.php

it results in

Code:

HTTP_ACCEPT_ENCODING gzip,deflate

But

Code:

Response Headers:

Date: Wed, 23 Apr 2008 02:08:43 GMT
Server: Apache
X-Powered-By: PHP/5.2.5
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/html

200 OK

When I put the same file in a normal user web it results in

Code:

HTTP_ACCEPT_ENCODING gzip,deflate

Code:

Response Headers:
Date: Wed, 23 Apr 2008 02:08:25 GMT
Server: Apache/2.0.55 (Ubuntu) PHP/5.1.2 mod_ssl/2.0.55 OpenSSL/0.9.8a
X-Powered-By: PHP/5.1.2
[B]Content-Encoding: gzip[/B]
Vary: Accept-Encoding
Keep-Alive: timeout=15, max=99
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8

200 OK

So here it does work as supposed.

For the admin panel it does not bother me too much, but when using Roundcube webmail it would be a great improvement, of course.
They try to use it when supported with this function:

PHP:

// set output buffering
if ($_action != 'get' && $_action != 'viewsource')
{
  // use gzip compression if supported
  if (function_exists('ob_gzhandler')
    && !ini_get('zlib.output_compression')
    && ini_get('output_handler') != 'ob_gzhandler')
  {
    ob_start('ob_gzhandler');
  }
  else
    ob_start();
}


But have no luck here

Any ideas/help on that?
Thanks

 

Thanks Till
But hmmm, why do I get an

Code:

ACCEPT-ENCODING gzip,deflate

from the

PHP:

<?php
phpinfo();
?> 

Cheers

 

I think you'd have to build mod_gzip for ISPConfig's Apache.
http://www.howtoforge.com/linux_apache_mod_gzip_5