nginx.conf

server {
    listen       $PORT;
    server_name  localhost;

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

    # Proxy all /api/ requests to the internal backend Cloud Run service.
    # The trailing slash on proxy_pass strips the /api prefix before forwarding,
    # so /api/query/execute becomes /query/execute on the backend.
    # BACKEND_URL is injected at container startup via docker-entrypoint.sh.
    location /api/ {
        proxy_pass            $BACKEND_URL/;
        proxy_http_version    1.1;
        proxy_set_header      Host              $proxy_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 $http_x_forwarded_proto;
        proxy_read_timeout    300s;
        proxy_connect_timeout 10s;
        proxy_send_timeout    300s;
    }
}