Drop-in integration. On any site, add:
<script src="https://your-collector/fp.js"
data-endpoint="https://your-collector/collect"
data-site-id="your-site"></script>
It auto-fires on DOMContentLoaded, collects the browser fingerprint, and POSTs once.
HAProxy captures TLS on the same connection, so JA3/JA4 and the browser data correlate by definition.
Waiting for auto-fire on page load...