title: Glimpse works only for 200 status code response (ASP.NET MVC)
body: <p>I'm trying to enable a Glimpse icon on all the error pages to see what happened behind the scenes where debugging and tracing is most important, and I cannot make Glimpse work.</p>
  
  <p>What I've tried:</p>
  
  <pre><code>&lt;glimpse defaultRuntimePolicy="On" endpointBaseUri="~/Glimpse.axd"&gt;
      &lt;runtimePolicies&gt;
        &lt;statusCodes&gt;
          &lt;add statusCode="500"/&gt;
          &lt;add statusCode="404"/&gt;
        &lt;/statusCodes&gt;
      &lt;/runtimePolicies&gt;
  &lt;/glimpse&gt;
  </code></pre>
  
  <p>Does not help - no Glimpse icon in the corner of error pages. On "200 OK" pages Glimpse works fine.</p>
  
  <p>I'm wondering if I'm the only one who thinks that tracing of request handling in case of exception is A MUST and #1 scenario that tools like Glimpse should cover?</p>