title: How do I stop IIS7 from putting out its own 404 before my MVC app gets a chance to handle it?
body: <p>I have an ASP.NET MVC 2 application, which has an Application_Error event handler in global.asax. In this, I'm detecting the case where the Exception type is HttpException and the HTTP code is 404, and redirecting to my own 404-handling page.</p>
  
  <p>This works fine on my Cassini development server, but now I'm trying to move it over to my production server which has IIS7 (<strong>using integrated mode</strong>).</p>
  
  <p>When I request a non-existent URL, IIS7 is showing its own 404 page, and so far as I can tell, my Application_Error method is never called.</p>
  
  <p>How do I fix that?</p>