# 全部代理
   location / {
   	  # 设置跨域
      add_header Access-Control-Allow-Origin *;
      add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
      add_header Access-Control-Allow-Headers *;
      # 代理到指定端口
      proxy_pass http://xxx.xx.xx.xx:xxxx;
      # options 快速返回 204
      if ($request_method = 'OPTIONS') {
          return 204;
      }
    }