server {
    listen 80;
    server_name _;

    location / {
        proxy_pass http://127.0.0.1:5000;
        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_read_timeout 300;
        proxy_send_timeout 300;
        # SSE streaming (/api/chat/stream) — no buffering, long read window
        proxy_buffering off;
        proxy_cache off;
        proxy_http_version 1.1;
        proxy_set_header Connection '';
        chunked_transfer_encoding on;
    }
}