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POImplement custom 401 handling for a WebBrowser control
 

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    <p>As per <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.webbrowser.createsink.aspx" rel="nofollow">this article</a>, I've extended the <code>System.Windows.Forms.WebBrowser</code> class to implement custom error-handling. Mostly, it works.</p> <p>The problem comes when the browser gets a "401 Unauthorized" response. That kind of response causes the <code>WebBrowser</code> control to display the standard Username / Password dialog. The <code>NavigateError</code> event isn't fired until that dialog is cancelled.</p> <p>So what can I do to capture the 401 response and handle it in my own custom way? </p> <p>I assumed there would be something I could do, such as that which I do to capture the <code>NavigateError</code> event, and handle those my own way but I haven't seen anything.</p> <p><strong>Edit: Solution Found!</strong><br> The important steps are:<br> 1. The WebBrowser control must <em>first</em> be navigated to a non-secure page ("about:blank" is the typical URL used) in order to avoid <a href="http://support.microsoft.com/kb/320153" rel="nofollow">KB 320153</a><br> 2. The host for the WebBrowser control must implement <code>IOleClientSite</code>, <code>IServiceProvider</code>, and <code>IAuthenticate</code>.<br> 3. <code>IServiceProvider.QueryService</code> must handle the <code>IAuthenticate</code> service request with the <code>IAuthenticate</code> implementation, all other service requests can be handled with the <code>INET_E_DEFAULT_ACTION</code> response.<br> 4. <code>IAuthenticate.Authenticate</code> is your custom authentication handler.</p>
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