[pex]

Hm. Switch temporarily CodeIgniter to 'production' mode to test whether this message disappears. Then turn back to 'development' to see this message again. Looks like there is a wrong PHP configuration setting, always_populate_raw_post_data - check what is its value. See how the following information might help:

https://github.com/bcit-ci/CodeIgniter/issues/3254
https://github.com/piwik/piwik/issues/6465

Thanks! I checked them and I know the problem is on the PHP configuration. Problem here is again that I can't modify it, the admin is very "conservative" and doesn't want to modify the global setup of environment since other applications are working fine.

As explained here
http://stackoverflow.com/questions/28278...m-backbone
"Some claim it happens when calling 

Code:

header()

 after some text has already been outputted."
And actually when i create my controller, extends from CI_Controller, there are new headers set automatically.

I wish then try to find a solution to avoid this header to be sent..