Find which method WCF will dispatch a RESTful request to

Suppose I implement a WCF REST service with the following contract.

[ServiceContract]
interface INotesService
{
    [OperationContract]
    [WebInvoke(Method = "GET",
        UriTemplate = "notes/{id}")]
    Note GetNote(string id);

    [OperationContract]
    [WebInvoke(Method = "GET",
        UriTemplate = "notes")]
    IEnumerable<Note> GetNotes();
}

Now, I have an HttpModule in the pipeline to do the authorization, but that code needs to know to which method the request will be dispatched. How do I find the signature of the method that will be invoked by WCF?

Even though the other answer put me on the right path, it did not really answer my question.

I later found this link which gave me a working solution: http://tech.blog.oceg.org/2009/04/authorizing-rest-calls-in-wcf.html

However, I found it to be more complex than needed. In .NET 4.5 (which is what I'm on) you can do the following.

I registered my ServiceAuthorizationManager from the ServiceHost.ApplyConfiguration override.

this.Authorization.ServiceAuthorizationManager = 
       new MyServiceAuthorizationManager();

Then, in its CheckAccessCore method, I called the method below to give me the name of the method to which the request will be dispatched.

private string GetOperationName(OperationContext operationContext)
{
    return messageProperties["HttpOperationName"] as string;
}