ThinkPHP 5.1 跨域中間件

<?php

namespace app\http\middleware;

class CrossDomain
{
    public function handle($request, \Closure $next)
    {
        header('Access-Control-Allow-Origin: *');
        header("Access-Control-Allow-Headers: Authorization, Sec-Fetch-Mode, DNT, X-Mx-ReqToken, Keep-Alive, User-Agent, If-Match, If-None-Match, If-Unmodified-Since, X-Requested-With, If-Modified-Since, Cache-Control, Content-Type, Accept-Language, Origin, Accept-Encoding");
        header('Access-Control-Allow-Methods: GET, POST, PATCH, PUT, DELETE');
        header('Access-Control-Max-Age: 1728000');
        if (strtoupper($request->method()) == "OPTIONS") {
            return response();
        }

        return $next($request);
    }
}