Enabling gzip throws an error

[blizam]

Grav 1.1.3, Admin 1.1.4

With Caching enabled when I enable gzip I get this error

Server Error
Sorry, something went terribly wrong!

E_WARNING - Cannot modify header information - headers already sent by (output started at /[root]/public_html/system/src/Grav/Common/Grav.php:341)
For further details please review your logs/ folder, or enable displaying of errors in your system configuration.

Logs:

2016-08-31 15:42:19] grav.CRITICAL: Cannot modify header information - headers already sent by (output started at /[root]/public_html/system/src/Grav/Common/Grav.php:341) - Trace: #0 [internal function]: Whoops\Run->handleError(2, 'Cannot modify h...', '/[root]/p...', 351, Array) #1 /[root]/public_html/system/src/Grav/Common/Grav.php(351): header('Content-Length:...') #2 [internal function]: Grav\Common\Grav->shutdown() #3 {main} [] []

The change persists/is successful

[blizam]

I tested on 2 seperate sites/servers... one running PHP 7 the other running PHP 5.6, same error

[rhukster]

I'm not able to replicate this. I'm running Gzip fine on my mac and on the ubuntu-based getgrav.org server. What is your server setup?

[blizam]

CentOS, Apache, suPHP

Gzip is running fine, the error is just associated with enabling it (which does work) from the Admin plugin

[rhukster]

ah! yes, i never changed it from admin.. will look into this.

[flaviocopes]

Uhm, replicated too

[kamauwanjoroge]

Replicated the same issue on LiteSpeed server with the latest version of PHP. The error renders the whole admin unusable.

[mahagr]

@askel45 Can you output the whole error?