title: IE 11 sends different User-Agent header to different subdomains
body: <p>Well, I've been working on an User-Agent based shared-session protection between subdomains.</p>
  
  <p>I was extremely surprised that it's been working well until IE 11 preview was released recently. There are 2 subdomains </p>
  
  <p><strong>example.com</strong> and <strong>sub.example.com</strong></p>
  
  <p>I've intercepted requests to both domains and it seems that USER-AGENT HTTP Header being sent to each domain is different.</p>
  
  <p>Request to example.com has:</p>
  
  <blockquote>
    <p>User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0)
    like Gecko</p>
  </blockquote>
  
  <p>Request to sub.example.com has:</p>
  
  <blockquote>
    <p>User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; SLCC2;
    .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media
    Center PC 6.0; .NET4.0C; .NET4.0E; BRI/1; MS-RTC LM 8; rv:11.0) like
    Gecko</p>
  </blockquote>
  
  <p>Do you have any idea what is the reason for this strange dynamic behavior?</p>