Hello!
In Short:
If I comment out the line below or set the value to false, then I get a blank page, when I use $this->redirect(…)
defined('YII_DEBUG') or define('YII_DEBUG', true);
(this line is in index.php)
In Detail (with some analysis):
I am using $this-redirect($someUrl) in some controller to redirect to another page, if the user has no rights to access the requested page. This works fine in Debug Mode, but not if I comment out the line above.
This problem happens on my local WAMPP (XAMPP on Windows) installation and also online.
I have latest Yii (2.0.2).
I tried to turn on Yii Logging in "Production Mode", but it does not log anything. Then I have checked the Apache Error Log and the Apache Access Log. The Error Log does not write any new log entries when I try to reproduce the problem, but in the Access Log I can see that for the "working case" I get Http Code 302, which is fine, but if YII_DEBUG is false (resp. the line above is commented out), then I get Http Code 500 only, and I get a blank page.
If I call a page which does not have any redirects (for example the login page), then it shows the page and it is working fine.
I also tried to explicitly set the error code like: $this->redirect($someUrl, 302)
Any ideas, where I should continue my analysis? I have no more ideas 
