初始化

app/middleware/AccessControl.php

@@ -0,0 +1,25 @@
+<?php
+namespace app\middleware;
+
+use Webman\Http\Request;
+use Webman\Http\Response;
+use Webman\MiddlewareInterface;
+
+class AccessControl implements MiddlewareInterface
+{
+    public function process(Request $request, callable $handler): Response
+    {
+        // 如果是opitons请求则返回一个空的响应，否则继续向洋葱芯穿越，并得到一个响应
+        $response = $request->method() == 'OPTIONS' ? response('') : $handler($request);
+
+        // 给响应添加跨域相关的http头
+        $response->withHeaders([
+            'Access-Control-Allow-Credentials' => 'true',
+            'Access-Control-Allow-Origin' => $request->header('origin', '*'),
+            'Access-Control-Allow-Methods' => $request->header('access-control-request-method', '*'),
+            'Access-Control-Allow-Headers' => $request->header('access-control-request-headers', '*'),
+        ]);
+
+        return $response;
+    }
+}