@Override
    public InvocationHandler create(Target target, Map<Method, MethodHandler> dispatch) {
      return new ReflectiveFeign.FeignInvocationHandler(target, dispatch);
    }
Like {@link InvocationHandler#invoke(Object, java.lang.reflect.Method, Object[])}, except for a
single method.
core/src/main/java/feign/InvocationHandlerFactory.java