server {
    listen 80;
    server_name localhost;

    # Allow large request bodies (screenshots are base64 encoded)
    client_max_body_size 50M;

    # Use Docker's internal DNS resolver (disable IPv6 to prevent SERVFAIL)
    resolver 127.0.0.11 ipv6=off valid=30s;
    set $backend http://master:9090;

    # Serve static files from the React build
    location / {
        root   /usr/share/nginx/html;
        index  index.html;
        try_files $uri $uri/ /index.html;
    }

    # Reverse proxy API requests to the Master backend container
    location /api/ {
        proxy_pass $backend;

        # Standard proxy headers
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        # Increase timeouts for long-running execution result uploads
        proxy_read_timeout 120s;
        proxy_send_timeout 120s;
        proxy_connect_timeout 30s;
    }
}