* initial commit

src/App/Middleware/PreFlightMiddleware.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Middleware;
+
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+class PreFlightMiddleware
+{
+    public function __invoke(RequestInterface $request, ResponseInterface $response, callable $next)
+    {
+        $requestMethod = strtoupper($request->getMethod());
+        if ($requestMethod == 'OPTIONS') {
+            return $response
+                ->withHeader('Accept', 'OPTIONS,GET,POST,PUT,PATCH,DELETE')
+                ->withHeader('Access-Control-Allow-Origin', '*')
+                ->withHeader('Access-Control-Allow-Methods', 'OPTIONS,GET,POST,PUT,PATCH,DELETE')
+                ->withHeader('Access-Control-Allow-Headers', 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization');
+        }
+        return $next($request, $response);
+    }
+}