ASP.NET MVC WebAPI 404 error

user_1320003 0
Viewed 94884

I have an asp.net web forms application running under v4.0 integrated mode.

I tried to add an apicontroller in the App_Code folder.

In the Global.asax, I added the following code

 RouteTable.Routes.MapHttpRoute(
      name: "DefaultApi",
      routeTemplate: "api/{controller}/{id}",
      defaults: new { id = System.Web.Http.RouteParameter.Optional }
 );

When I tried to navigate to the controller at http://localhost/api/Value, I get the 404 error.

The extensionless url is configured in the handler section. I have forms and anonymous authentication enabled for the website.

ExtensionLess url is configured for '*.'

When I hit the url for controller, the request is handled by StaticHandler instead of ExtensionlessUrlHandler-Integrated-4.0.

I have no clue now why the system will throw the error as shown in the image below. Error

asp.net-web-api asp.net-mvc asp.net c#
20 Answers

Thanks to Shannon, ceinpap, and Shri Guru, the following modification works for me:

  1. WebApiConfig.cs:

    public static void Register(HttpConfiguration config)
{
    ...
    config.Routes.MapHttpRoute(
        name: "DefaultApi",
        routeTemplate: "api/{controller}/{action}/{id}",
        defaults: new { id = RouteParameter.Optional }
    );
}

  2. Global.asax.cs:

    protected void Application_Start()
{
    ...
    GlobalConfiguration.Configure(WebApiConfig.Register);
    RouteConfig.RegisterRoutes(RouteTable.Routes);
    ...
}
user_84984000

The sequence of registering the route, was the issue in my Application_Start(). the sequence which worked for me was 

AreaRegistration.RegisterAllAreas();
GlobalConfiguration.Configure(WebApiConfig.Register);
RouteConfig.RegisterRoutes(RouteTable.Routes);

earlier it was

AreaRegistration.RegisterAllAreas();
RouteConfig.RegisterRoutes(RouteTable.Routes);
GlobalConfiguration.Configure(WebApiConfig.Register);
user_19408030
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