title: host name who using my API controller in mvc 5
body: <p>IN MVC 5 PROJECT
  suppose I have API like </p>
  
  <pre><code>abc.com/authonication?userName=asdklfsdf&amp;token=ASDF45FEWF312DFSFWE465SDF465
  </code></pre>
  
  <p>And some another web app (example.com) use this API</p>
  
  <p>In my controller, I want to get the host name (example.com) of domain who using this API to validate </p>