Twilio Segment Edge SDK powered by Cloudflare Workers

This post details the development of the Segment Edge SDK, which leverages Cloudflare Workers to solve challenges in first-party data collection and real-time personalization. It explains how the SDK injects analytics.js snippets into web pages using HTMLRewriter, proxies Segment CDN and API endpoints to first-party domains, and sets HTTPOnly cookies to maintain user identity. The technical implementation involves a router within the Worker to match request URLs and execute specific handlers for asset proxying, event forwarding, and HTML enrichment.