Analytics Forwarding

The browser SDK captures all events and acts as an intelligent proxy — forwarding to your existing tools while building your own data lake.

How It Works

Browser → headless.ly/events → ┬→ Google Analytics (web analytics)
                                ├→ Sentry (error tracking)
                                ├→ PostHog (product analytics)
                                └→ Iceberg R2 Lakehouse (your data)

Setup

<script src="https://js.headless.ly/v1"
  data-tenant="my-startup"
  data-ga="G-XXXXXXXXXX"
  data-sentry-dsn="https://xxx@sentry.io/xxx"
  data-posthog-key="phc_xxx"
/>

One script tag. Events flow everywhere.

Or with npm:

import { Headlessly } from '@headlessly/js'

Headlessly.init({
  ga: 'G-XXXXXXXXXX',
  sentryDsn: 'https://xxx@sentry.io/xxx',
  posthogKey: 'phc_xxx',
})

What Gets Captured

Progressive Capability

• Phase 1: Forward everything, store everything
• Phase 2: Basic funnel analysis from your own data
• Phase 3: Replace external tools one by one

Day 1: external tools handle the heavy lifting. Over time, the lakehouse enables more. You never lose data.

Edge Proxy

Cloudflare Snippets handle the proxy at the edge:

• Intercept analytics/error requests
• Forward to external providers
• Also forward to ingest endpoint
• Zero latency impact (< 5ms, < 32KB)