docs: private Response execute(final Builder theRequestBuilder, final String methodKey)
              throws IOException {
          final JaxRsRequest theRequest = theRequestBuilder.build();
          final BaseMethodBinding<?> method = getBinding(theRequest.getRestOperationType(), methodKey);
          try {
              return (Response) method.invokeServer(this, theRequest);
          }
          catch (final Throwable theException) {
              return handleException(theRequest, theException);
          }
      }