src/Server/RequestHandler.php
public function handle(ServerRequestInterface $request): ResponseInterface
    {
        $response = call_user_func($this->callback, $request);
        return $response;
    }
public function handle(ServerRequestInterface $request): ResponseInterface
    {
        $response = call_user_func($this->callback, $request);
        return $response;
    }
Handle the request and return a response.

@param ServerRequestInterface $request

@return ResponseInterface