title: using PreSendRequestHeaders Event in global.asax
body: <p>I tried to assign the PreSendRequestHeaders Event in the global.asax file in the "Application_Start" method. But this does not work. </p>
  
  <pre><code>private void Application_Start()
  {
      PreSendRequestHeaders += OnPreSendRequestHeaders;           
  }
  
  private void OnPreSendRequestHeaders(object sender, EventArgs e)
  {
     // this is not called
  }
  </code></pre>
  
  <p>The OnPreSendRequestHeaders is not called, why?
  Is it possible to assign the PreSendRequestHeaders method in the global.asax?</p>