proxy_http_version          1.1;

proxy_set_header Accept-Encoding "";
proxy_set_header Connection $connection_upgrade;
proxy_set_header Host $http_host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Real-IP $remote_addr;