title: Notice: Undefined index: HTTPS even when running on HTTPS
body: <p>Centos 6.5
  Plesk 11.5
  PHP 5.3.3</p>
  
  <p>I have installed a SSL sertificate on a website and it looks like its running like it should (chrome, firefox etc.. accepts is with a green lock).</p>
  
  <p>Now, my problem is that $_SERVER['HTTPS'] is empty/false.</p>
  
  <p>I get messages like: Undefined index: HTTPS in ...</p>
  
  <p>Does anybody have any clue why HTTPS is not being set?</p>