title: InvalidOperationException thrown regarding DotNetOpenAuth.IEmbeddedResourceRetrieval with Razor view
body: <p>When my Razor view calls <code>@Html.OpenIdSelector(...</code> I get an <code>InvalidOperationException</code>:</p>
  
  <blockquote>
    <p>The current IHttpHandler is not one of
    types: System.Web.UI.Page,
    DotNetOpenAuth.IEmbeddedResourceRetrieval.
    An embedded resource URL provider must
    be set in your .config file.</p>
  </blockquote>
  
  <p>What exactly should I set in the <code>config</code> file? </p>