The inner handler has not been assigned. RSS

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  rgraham

  Member

  2 Points

  4 Posts

  The inner handler has not been assigned.

  Dec 19, 2012 06:41 AM|LINK

  Hi Everyone,

  I may have found a bug in ASP.NET WebAPI but I'm hoping that I'm just "doing it wrong." My scenario is that I've created a DelegatingHandler to look for the Authorization header, verify the value, and return the appropriate response code should it not be present or verification failed.

  The problem however is that I don't want this message handler to run for all routes and therefore I have it configured for my DefaultApi route like so:

  config.Routes.MapHttpRoute(
      name: "DefaultApi",
      routeTemplate: "api/{controller}/{id}",
      defaults: new { id = RouteParameter.Optional },
      constraints: null,
      handler: new AuthorizationMessageHandler()
  );

  rather than globally:

  config.MessageHandlers.Add(new AuthorizationMessageHandler());
  

  When adding the handler via DefaultApi route I recieve the error: "The inner handler has not been assigned." I don't receive this error when the handler is configured globally.

  This will fail with even the most basic DelegatingHandler:

  public class AuthorizationMessageHandler : DelegatingHandler
  {
   
   
   
      protected override System.Threading.Tasks.Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
      {
   return base.SendAsync(request, cancellationToken);
      }		 
  }

  Having said that, am I doing something wrong or does this look to be a bug in WebAPI?

  Thanks in advance for your help!

  Ryan

  http://www.rjygraham.com
  • Edited by rgraham on Dec 19, 2012 06:42 AM
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  dbaier

  Member

  264 Points

  66 Posts

  MVP

  Re: The inner handler has not been assigned.

  Dec 19, 2012 07:46 AM|LINK

  You need to set the InnerHandler on per-route handlers. 

  See here:

  https://github.com/thinktecture/Thinktecture.IdentityModel.45/blob/master/IdentityModel/Thinktecture.IdentityModel/Tokens/Http/AuthenticationHandler.cs

  cheers,
  dominick
  _____________________________
  Dominick Baier - http://www.leastprivilege.com
  
  • Marked as answer by rgraham on Dec 20, 2012 05:16 AM
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  rgraham

  Member

  2 Points

  4 Posts

  Re: The inner handler has not been assigned.

  Dec 20, 2012 05:16 AM|LINK

  Thanks Dominick - that's exactly what I needed!

   

  Ryan

  http://www.rjygraham.com