title: Self Hosted WebAPI requested twice
body: <p>I'm learning about self-hosted web api, owin/katana and I came with this example:</p>
  
  <p>Source: <a href="http://pastebin.com/0hsiEsdP" rel="nofollow">http://pastebin.com/0hsiEsdP</a></p>
  
  <p>I pasted it on pastebin because here I keep getting "your code is not formatted" even between code tags =\</p>
  
  <p>So, there's two middlewares in the pipeline, one for "logging" and the other to just write something as response.</p>
  
  <p>When I execute it and open the url in browser, it prints the "logging" message twice, like this:</p>
  
  <p>Server started
  [Request from ::1]
  [Request from ::1]</p>
  
  <p>The question is: why it's executed twice if I did only one request ?</p>
  
  <p>Thanks!</p>