title: Request.RequestUri.GetLeftPart(UriPartial.Authority) returns null value
body: <p>I'm trying to get the base of url using the following command : 
  <code>string baseUrl = Request.RequestUri.GetLeftPart(UriPartial.Authority);</code> which returns a null value. <code>Request.RequestUri</code> returns <code>http://10.71.34.1:63026/api/member/profilethumb/PetePentreath</code> but I only want <code>http://10.71.34.1:63026/</code> and the rest of the url chopped off. How do I do this?</p>