nginx.conf

server {
    listen 80;

    location / {
        proxy_pass http://sample/;
        proxy_http_version 1.1;
        proxy_set_header   Upgrade $http_upgrade;
        proxy_set_header   Connection keep-alive;
        proxy_set_header   Host $host;
        proxy_cache_bypass $http_upgrade;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header   X-Forwarded-Proto $scheme;
    }

    location /chat {
        # App server url
        proxy_pass http://sample;

        # Configuration for WebSockets
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_cache off;
        # WebSockets were implemented after http/1.0
        proxy_http_version 1.1;

        # Configuration for ServerSentEvents
        proxy_buffering off;

        # 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;
    }
}