server {
    listen 80;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;

    # O backend responde o chat em SSE; o proxy não deve bufferizar a resposta.
    location /api/ {
        proxy_pass http://backend:8000;
        proxy_http_version 1.1;
        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;

        proxy_buffering off;
        proxy_cache off;
        proxy_read_timeout 300s;
        proxy_send_timeout 300s;
        chunked_transfer_encoding on;
    }

    location / {
        try_files $uri $uri/ /index.html;
    }

    location ~* \.(js|css|woff2?|png|svg|ico)$ {
        expires 30d;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }
}