ukmesh/nginx.app.conf

server {
    listen 80;
    root /usr/share/nginx/html;
    index index.html;
    resolver 127.0.0.11 valid=10s ipv6=off;

    # WebSocket upgrade — must come before the /api block
    location /ws {
        set $backend_upstream http://backend:3000;
        proxy_pass $backend_upstream;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_read_timeout 3600s;
    }

    # API and health check proxy to backend
    location ~ ^/(api|healthz)(/|$) {
        set $backend_upstream http://backend:3000;
        proxy_pass $backend_upstream;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    # SPA fallback
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Cache immutable built assets aggressively.
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # Always revalidate shell + service worker so deploys appear quickly.
    location = /index.html {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }
    location = /sw.js {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }
}