Twilio Segment Edge SDK powered by Cloudflare Workers

What this post added

This post details how Twilio Segment built their Edge SDK on Cloudflare Workers to address challenges in first-party data collection and real-time personalization. It explains the architecture of the Edge SDK, including how it injects analytics.js snippets into web pages, proxies Segment CDN and API requests to first-party domains, and rewrites client-side cookies as HTTPOnly cookies for persistent user identity. The post highlights the use of Cloudflare Workers' scalability, no cold-start, and Workers KV for storage, as well as the HTMLRewriter API for modifying HTML responses.