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POASP.NET Web API Self-Host with Windows Authentication
 

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    <p>I am trying to use the ASP.NET Web API Self-Host option with Windows authentication so I can determine the logged on user and ultimately accept or reject the user based on their identity. Here is my console application code:</p> <pre><code>using System; using System.Web.Http; using System.Web.Http.SelfHost; namespace SelfHost { class Program { static void Main(string[] args) { var config = new HttpSelfHostConfiguration("http://myComputerName:8080"); config.UseWindowsAuthentication = true; config.Routes.MapHttpRoute( "API Default", "api/{controller}/{id}", new { id = RouteParameter.Optional }); using (HttpSelfHostServer server = new HttpSelfHostServer(config)) { server.OpenAsync().Wait(); Console.WriteLine("Press Enter to quit."); Console.ReadLine(); } } } } </code></pre> <p>Here is the controller:</p> <pre><code>[Authorize] public class HelloController : ApiController { public string Get() { // This next line throws an null reference exception if the Authorize // attribute is commented out. string userName = Request.GetUserPrincipal().Identity.Name; return "Hello " + userName; } } </code></pre> <p>Edit - I added the Authorize attribute, and the debugger shows that the code inside the Get action method is never invoked. The following HTML is returned:</p> <pre><code>&lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"&gt; &lt;HTML&gt;&lt;HEAD&gt; &lt;META content="text/html; charset=windows-1252" http-equiv=Content-Type&gt;&lt;/HEAD&gt; &lt;BODY&gt;&lt;/BODY&gt;&lt;/HTML&gt; </code></pre> <p>If the Authorize attribute is commented out, <code>Request.GetUserPrincipal().Identity.Name</code> throws a null reference exception since <code>Request.GetUserPrincipal()</code> yields null.</p>
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    1. COYou just need to put a break point and find out which property above is null... is "ControllerContext" null? or "Request" or "GetUserPrincipal()" or "Identity"?
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      1. USTimothy Khouri
    2. COYeah, what property is generating the null ref?
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      1. USmarcind
    3. CO@marcind the `Request.GetUserPrincipal()` is null. I added the `[Authorize]` attribute as suggested by Eric King and then I just receive a bare bones HTML page with no content between two body tags and it never runs the code inside my `Get` action method in the controller class.
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