初始化-安装依赖

server/plugin/saiadmin/app/middleware/CrossDomain.php

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+<?php
+// +----------------------------------------------------------------------
+// | saiadmin [ saiadmin快速开发框架 ]
+// +----------------------------------------------------------------------
+// | Author: sai <1430792918@qq.com>
+// +----------------------------------------------------------------------
+namespace plugin\saiadmin\app\middleware;
+
+use Webman\Http\Request;
+use Webman\Http\Response;
+use Webman\MiddlewareInterface;
+
+/**
+ * 跨域中间件
+ */
+class CrossDomain implements MiddlewareInterface
+{
+    public function process(Request $request, callable $handler) : Response
+    {
+        // 如果是options请求则返回一个空响应，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;
+    }
+}