URL mapping for self hosted WCF services

I have a WCF service DLL and when I debug it gets auto hosted and this custom URL mapping works:

    [OperationContract]
    [WebInvoke(Method = "GET", UriTemplate = "widget/{myid}")]
    public Widget GetWidget(string myid) {...

My config file has:

<system.webServer>
  <modules runAllManagedModulesForAllRequests="true">
  <add name="UrlRoutingModule" type="System.Web.Routing.UrlRoutingModule, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=c03f5f7f11d50a3b" />
  </modules>
  </system.webServer>

However I want to host insid开发者_如何学运维e my own service so I think now instead it uses the system.serviceModel section of the config instead and so I can't use System.Web.Routing.UrlRoutingModule.

I have the self hosted service working; however, it is automatically calling my URL GetWidget instead of widget/{myid}. So it is not using my WebInvoke attribute.

If I'm manually hosting my WCF service in my own Windows NT Service via a ServiceHost object, how can I still support custom URLs with the same type of mapping?