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POWebAPI route message handler from other route gets called
 

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    <p>I'm currently using WebAPI running on OWIN/Katana. I've defined two message handlers:</p> <ul> <li><code>CorsHandler</code>: Allowing CORS (Cross-origin resource sharing), will be applied on all HTTP messages</li> <li><code>HmacAuthenticationHandler</code>: Checks if the user is authenticated, will only be applied on routes which needs authentication.</li> </ul> <p>My <code>HttpConfiguration</code> will be configured like this:</p> <pre><code>var config = new HttpConfiguration(); /* configure routes for the web API */ // ### public routes ### config.Routes.MapHttpRoute("IndexRoute", "", new {controller = "Main", action = "get"}); config.Routes.MapHttpRoute("LoginRoute", "login", new {controller = "Account", action = "Login"}); config.Routes.MapHttpRoute("RegisterRoute", "register", new {controller = "Account", action = "Register"}); // ### routes that need authentication ### // according to http://www.asp.net/web-api/overview/working-with-http/http-message-handlers (last example) // List of delegating handlers. var handlers = new DelegatingHandler[] { new HmacAuthenticationHandler(controllerConfig.StorageHelper.UserLoginInfo) }; // Create a message handler chain with an end-point. var routeHandlers = HttpClientFactory.CreatePipeline(new HttpControllerDispatcher(config), handlers); // configure route config.Routes.MapHttpRoute("DefaultRoute", "{controller}/{id}", new {id = RouteParameter.Optional}, null, routeHandlers); /* other settings (JSON formatting, ...) */ /* dependency resolver, which will pass an instance of my DAO factory to each controller */ config.DependencyResolver = new ControllerDependencyResolver(daoFactory); /* apply CORS message handler to all messges */ config.MessageHandlers.Add(new CorsHandler()); </code></pre> <p>If I call an Web API method via AJAX call, which <strong>needs authentication</strong> (e.g. "127.0.0.1:80/test/id") everything work as expected. The message handler will be called as shown below:</p> <p><strong>Valid</strong> user credentials:</p> <p>Client -> CorsHandler -> HmacAuthenticationHandler -> TestController (get(id)) -> CorsHandler -> HmacAuthenticationHandler -> Client (OK-200)</p> <p><strong>Invalid</strong> user credentials:</p> <p>Client -> CorsHandler -> HmacAuthenticationHandler -> CorsHandler -> HmacAuthenticationHandler -> Client (Unauthorized request-403)</p> <hr> <p>But if I call an Web API method via AJAX call, which <strong>don't need authentication</strong> (e.g. "127.0.0.1:80/login"). The HmacAuthenticationHandler will be called "on the way back to the client", even though it is not assigned to this route:</p> <p>Client -> CorsHandler -> AccountController(login) -> CorsHandler -> <strong>HmacAuthenticationHandler</strong> -> Client (OK-200)</p> <p>Why will the <code>HmacAuthenticationHandler</code> be called on the "public route" (during the response)? Strange thing is it'll not influence the response, client still gets OK-200.</p> <hr> <p><strong>Update</strong></p> <p>I've created a sample project and replaced all internal interfaces/implementations with fake ones, the code can be found and downloaded on BitBucket:</p> <p><a href="https://bitbucket.org/Robar/stackoverflowquestionwebapi" rel="nofollow">https://bitbucket.org/Robar/stackoverflowquestionwebapi</a></p>
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    1. COThis should not be happening. Would it be possible for you to share a repro so that we can take a look at it?
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      1. USKiran Challa
    2. CO@KiranChalla I'll try to extract the important classes and upload them somewhere like github on monday when I'm back at work.
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    3. CO@KiranChalla I've updated my Question with the sample code.
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