code: private HandlerAdapter getHandlerAdapter(HttpRequest request) {
          for (HandlerAdapter ha : mAdapterList) {
              if (ha.intercept(request)) return ha;
          }
          return null;
      }
docs: Return the {@link RequestHandler} for this request.
  
  @param request current HTTP request.
  
  @return the {@link RequestHandler}, or {@code null} if no handler could be found.