TYPO3 Core

I can confirm this issue on a website running at Domainfactory...
Please tell whether you have phpMyAdmin installed and in what version.
Please also look into the headers sent back to the client and look for "Transfer-Encoding".
Thanks!

I can confirm this problem with Domainfactory and PMA 4.2.0 / PMA 4.3.0.
After uninstalling PMA the problem is gone.

I can reproduce it on one site using 4.3-dev
not reproducable on another site running 4.2.6, but also with BE-compression enabled.
Both on dF-servers.

Could you find out anything more about this bug? Is PMA responsible for it or does this TYPO3 bug only caused by PMA?

I have the same error, with 4.3 now logged:

Core: Error handler (BE): PHP Warning: ob_start() [ref.outcontrol]: output handler 'ob_gzhandler' cannot be used after 'URL-Rewriter' in /../typo3_src-4.3.0/typo3/init.php line

I have this error only when the PMA is installed. Of course the newest version.

This one is still valid, does anyone have an idea?

Tobias, are you also at domainfactory?

Don't know if it's a good idea to move the compression block around.

Any news on this issue?

Can somebody using Domainfactory please post the "zlib.*" part of the php.ini? I guess that compression is already enabled/defined there - thus, checking in TYPO3 if compression is already enabled should be enough.

Settings are
zlib.output_compression Off Off
zlib.output_compression_level -1 -1
zlib.output_handler no value no value

Searching the web shows we're not alone..

I found a PHP bug from back in 2003, when this error message was introduced: http://bugs.php.net/24315

PHP now (latest stable CVS) reports the correct error message
(ob_start(): output handler 'ob_gzhandler' cannot be used after
'URL-Rewriter') if you call ob_start('ob_gzhandler'); after
session_start hs been called and trans_sid is used.
The solution is to call ob_start('ob_gzhandler'); before
session_start().

In EXT:phpmyadmin/res/phpMyAdmin-xxx/libraries/session.inc.php I see the following lines:

// but not all user allow cookies
@ini_set('session.use_only_cookies', false);
@ini_set('session.use_trans_sid', true);
@ini_set('url_rewriter.tags', 'a=href' ...)

As we 'can' cookies, I suggest to just remove these ini_set().
As adviced, session_start() is called afterwards, but I think TYPO3 itself already started a session.

Can sb. have a quick check on deactivating these lines, please?

Doesn't work..

In 6.x it's different due to the overworked bootstrap mechanism.
TYPO3 4.5 uses t3lib_utility_Http::redirect() in the backend user authentication which exits after a redirect.

Thus, in case of a redirect, the ob_gzhandler won't be triggered anymore.

What the heck does this mean and how can I fix it? This is only displayed once per browser session. It disappears by clicking refresh or going back to the page.

Warning: ob_start(): output handler 'ob_gzhandler' cannot be used after 'URL- [Rewriter][https://seotoolsystem.com/ai-paragraph-rewriter-online] ' in /home/public_html/forums/pageheader.php on line 18

Here's the snippet of code for that section:

$gzip_compressed = 0;
if($config['use_gzip_compression'] == 1) {
if(phpversion() >= "4.0.4") {
if(extension_loaded("zlib")) {
ob_start("ob_gzhandler");
$gzip_compressed = 1;
}
}
}

if($gzip_compressed 0 && $config['activate_ob'] 1) {
ob_start();
}