就想到用nginx前置過濾，url-->nginx-->真正伺服器

nginx處理: 

2.遇到options請求，直接返回，並帶上指定head

例如：真實服務在127.0.0.1:8080,域名為 platform-api-test.zzg.me

server {

        listen 80;
        server_name platform-api-test.1yd.me;
      
        location / {

                if ($request_method = OPTIONS ) {
                        add_header Access-Control-Allow-Origin "*";
                        add_header Access-Control-Allow-Methods "POST, GET, PUT, OPTIONS, DELETE";
                        add_header Access-Control-Max-Age "3600";
                        add_header Access-Control-Allow-Headers "Origin, X-Requested-With, Content-Type, Accept, Authorization";

                        #add_header Access-Control-Allow-Credentials "true";
                        add_header Content-Length 0;
                        #add_header  Access-Control-Max-Age "3600";
                        add_header Content-Type text/plain;
                        return 200;
                 }

                proxy_pass http://webservers;
        }
}