Populating an Web Api action method parameter using an action filter no longer works in MVC 4 RTM.
Used to work in RC...

To duplicate the issue:

• Create a default Web Api project
  
• Add a POST method to ValuesController, as such
  [AuthorizationKeyFilterAttribute("applicationToken")]
  public void Post(Guid applicationToken)
  {
  }
  
• Create the action filter attribute as
  [AttributeUsage(AttributeTargets.Method)]
  public sealed class AuthorizationKeyFilterAttribute : System.Web.Http.Filters.ActionFilterAttribute
  {
  public AuthorizationKeyFilterAttribute(string parameterName)
  {
  ParameterName = parameterName;
  }
  
  public string ParameterName { get; private set; }
  
  public override void OnActionExecuting(HttpActionContext actionContext)
  {
  var value = actionContext.Request.Headers.Authorization;
  actionContext.ActionArguments[ParameterName] = value;
  }
  }
  

Run with:

• Url: http://localhost:8100/api/values/
• Method: POST
• Headers: Authorization: 7199e463-3a9b-4843-94d9-0dce9e728dbb
  

I get the following error:
{"Message":"No HTTP resource was found that matches the request URI 'http://localhost:8100/api/values/'.","MessageDetail":"No action was found on the controller 'Values' that matches the request."}

Any ideas how can I get this feature working again ?