Neos\Flow\Core\Bootstrap::registerRequestHandler PHP Method

    public function registerRequestHandler(RequestHandlerInterface $requestHandler)
    {
        $this->requestHandlers[get_class($requestHandler)] = $requestHandler;
    }

 /**
  * Invokes custom PHP code directly after the package manager has been initialized.
  *
  * @param \Neos\Flow\Core\Bootstrap $bootstrap The current bootstrap
  * @return void
  */
 public function boot(\Neos\Flow\Core\Bootstrap $bootstrap)
 {
     $bootstrap->registerRequestHandler(new \Neos\Setup\Core\RequestHandler($bootstrap));
 }