title: Application_AuthenticateRequest hit for all requests, including images and js files
body: <p>In my MVC3 application, I'm using Application_AuthenticateRequest to create my custom user context and create the session.  However, I notice that this is getting fired for every file per page request, including images, js, css, etc.</p>
  
  <p>Is this the right method to do what I'm trying to do, or should I be doing this somewhere else (i.e. action filter)?  Or, is this the right place, I just need to put some checks and/or configuration to ensure this method (or my block of code) is just executed for page requests instead of requests for static files?</p>
  
  <p>I searched for a while trying to find the answer, and found one specific to IIS7, but this is happening for me on my ASP.NET dev server (debugging) on WinXP.  Other than that, I couldn't find much, which leads me to think I may be way off on something here, possibly overlooking something simple.</p>
  
  <p>Thanks in advance.</p>