proxy_http_version  1.1;
proxy_set_header    Upgrade $http_upgrade;
proxy_set_header    Connection $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_set_header    X-Forwarded-Proto $scheme;
expires             off;
