* initial commit

src/App/Handler/PingHandler.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Handler;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Zend\Diactoros\Response\JsonResponse;
+
+class PingHandler implements RequestHandlerInterface
+{
+    public function handle(ServerRequestInterface $request) : ResponseInterface
+    {
+        return new JsonResponse(['ack' => time()]);
+    }
+}