Vercel's CDN Will Stop Stripping Server-Timing Headers on August 10
Vercel Changelog·medium signal
Vercel announced that starting August 10, 2026 its CDN will pass the Server-Timing response header through to the client instead of stripping it, enabling backend metrics like database query time to reach browser devtools and RUM tooling. This is a quiet breaking change for anyone who has been using Server-Timing internally and assuming the CDN kept it private. Audit what you're putting in that header before the date — backend timing data becomes publicly visible.