code: function addProcessResponseMethod() {
  
          $methodGenerator = new MethodGenerator('processResponse');
  
          $body = '';
          $body .= $this->generateResponseFragment();
  
          $docBlock = $this->generateExecuteDocBlock('Dispatch the request for this operation and process the response. Allows you to modify the request before it is sent.');
  
          $methodGenerator->setDocBlock($docBlock);
          $methodGenerator->setBody($body);
  
          $parameters = [];
          $parameters[] = new ParameterGenerator('response', 'Amp\Artax\Response');
          $methodGenerator->setParameters($parameters);
          $tag = createParamTag($parameters[0], 'The HTTP response.');
          $docBlock->setTag($tag);
  
          $this->classGenerator->addMethodFromGenerator($methodGenerator);
      }
docs: Add a method that process the response from the raw body, to the final type of
  the opeartion.