Fix: Cross origin websockets not allowed

[Ansen]

环境:

Docker-compose + nginx (https) 反代

配置信息

Docker 环境变量配置:

      - DOMAIN=qiandao.example.com:8443
      - REDISCLOUD_URL=redis://redis:6379
      - PBKDF2_ITERATIONS=400
      - AES_KEY=Xx****xX
      - COOKIE_SECRET=Xx****xX

Nginx 配置:

    location / {
        proxy_http_version 1.1;
        proxy_connect_timeout 60s;
        proxy_read_timeout 5400s;
        proxy_send_timeout 5400s;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://127.0.0.1:8923/;
    }

问题重现步骤：

使用域名访问公共模板库，点击重建缓存，可在开发者工具中看到 /subscribe/1/updating/ 访问失败，后端日志状态码显示403，开启Debug后，可看到具体的报错为：

tornado.general websocket:267] Cross origin websockets not allowed

解决：

添加 check_origin 函数配合配置项 domain 进行跨域验证以解决该问题