nginx

map $http_connection $connection_upgrade {
    "~*Upgrade" $http_connection;
    default keep-alive;
}

server {
        server_name viewer.reqifsharp.org;
        
        location / {
            proxy_pass http://127.0.0.1:5000;

            # Configuration for WebSockets
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;
            proxy_cache off;

            # WebSockets were implemented after http/1.0
            proxy_http_version 1.1;

            # Configuration for LongPolling or if your KeepAliveInterval is longer than 60 seconds
            proxy_read_timeout 100s;

            proxy_set_header Host $host;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
            
            # kill cache
            add_header Last-Modified $date_gmt;
            add_header Cache-Control 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
            if_modified_since off;
            expires off;
            etag off;
        }
}