src/Server/StandardServer.php
public function processPsrRequest(
        ServerRequestInterface $request,
        ResponseInterface $response,
        StreamInterface $writableBodyStream
    ) {
        $result = $this->executePsrRequest($request);

        return $this->helper->toPsrResponse($result, $response, $writableBodyStream);
    }
public function processPsrRequest(
        ServerRequestInterface $request,
        ResponseInterface $response,
        StreamInterface $writableBodyStream
    ) {
        $result = $this->executePsrRequest($request);

        return $this->helper->toPsrResponse($result, $response, $writableBodyStream);
    }
Executes PSR-7 request and fulfills PSR-7 response.

See `executePsrRequest()` if you prefer to create response yourself
(e.g. using specific JsonResponse instance of some framework).

@return ResponseInterface|Promise

@api