pyws_clock/nginx_server.conf

server {
        listen 80 default_server;
        listen [::]:80 default_server;

        root /var/www/clock/;

        index index.html;

        server_name _;

        location / {
                try_files $uri $uri/ =404;
        }

        location /wsclock/ {
                proxy_pass http://127.0.0.1:8901;
                proxy_http_version 1.1;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "Upgrade";
                proxy_set_header Host $Host;
        }

}