RoutingErrorMiddleware

Solo\Application\RoutingErrorMiddleware answers a RoutingException with an empty response of its status and headers. See Routing Errors for usage.

final readonly class RoutingErrorMiddleware implements Psr\Http\Server\MiddlewareInterface

List it right before RoutingMiddleware, so every middleware in front of it sees and can decorate its responses. Application registers it in the container, and Application::handle() also wraps the whole pipeline in the instance from the container, to answer routing exceptions that nothing caught.

__construct()

public function __construct(ResponseFactoryInterface $responseFactory)

$responseFactory creates the responses.

process()

public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface

Returns the response of $handler. If $handler throws a RoutingException, returns $exception->applyTo($responseFactory->createResponse()): an empty response with the exception's status and headers, such as Allow for 405. Other exceptions propagate.