created empty endpoint to handle request without db connect (#12)

* created empty endpoint which not using db connect to handle request

* codestyle

config/request-handling.php

@@ -18,6 +18,7 @@
             'exception'     => yii::referenceTo(\hiapi\Core\Http\Psr15\Middleware\ExceptionMiddleware::class),
             'blacklist'     => yii::referenceTo(\hiapi\Core\Http\Psr15\Middleware\BlacklistMiddleware::class),
             'user-real-ip'  => yii::referenceTo(\hiapi\Core\Http\Psr15\Middleware\UserRealIpMiddleware::class),
+            'empty-endpoint'=> yii::referenceTo(\hiapi\Core\Http\Psr15\Middleware\EmptyEndpointMiddleware::class),
             'auth'          => yii::referenceTo(\hiapi\Core\Auth\AuthMiddleware::class),
             'router'        => yii::referenceTo(\hiapi\Core\Http\Psr15\Middleware\RouterMiddleware::class),
             'perform'       => yii::referenceTo(\hiapi\Core\Http\Psr15\Middleware\EndpointMiddleware::class),

src/Http/Psr15/Middleware/EmptyEndpointMiddleware.php

@@ -0,0 +1,22 @@
+<?php
+declare(strict_types=1);
+
+namespace hiapi\Core\Http\Psr15\Middleware;
+
+use hiapi\Core\Http\Psr7\Response\FatResponse;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+
+final class EmptyEndpointMiddleware implements MiddlewareInterface
+{
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        if ($request->getUri()->getPath() === '/emptyEndpoint') {
+            return FatResponse::create([], $request);
+        }
+
+        return $handler->handle($request);
+    }
+}