title: ASP.NET MVC 4 intercept all incoming requests
body: <p>Is there a way for me to catch <strong>all</strong> incoming requests to my ASP.NET MVC 4 app and run some code before continuing the request onward to the specified controller/action?</p>
  
  <p>I need to run some custom auth code with existing services, and to do this properly, I'll need to be able intercept all incoming requests from all clients to double check some things with the other service.</p>