/**
* Execute the server.
*
* @param callable $errorHandler The error handler callback.
*/
public function listen($errorHandler = null)
{
if (version_compare(PHP_VERSION, '5.4', '>=') && $this->handler instanceof \Closure) {
$this->handler = $this->handler->bindTo($this);
}
$response = call_user_func($this->handler, $this->request, $this->response, $errorHandler);
if (!$response instanceof ResponseInterface) {
$response = $this->response;
}
$this->output->respond($response);
}
