Server-Timing header
type: TechArticle
description: Server-Timing surfaces backend metrics — database time, cache hits, edge processing — in browser DevTools and to RUM via the PerformanceServerTiming API. Send it when you measure server-side latency, and keep the values free of sensitive infrastructure detail.
language: en
is part of: Web Specification Studio
author: Web Specification Studio
publisher: Web Specification Studio
license: https://creativecommons.org/licenses/by/4.0/
date modified: 2026-06-18T00:00:00.000Z
citation: Server Timing — the Server-Timing header field
  type: CreativeWork
  publisher: W3C
citation: MDN — Server-Timing
  type: CreativeWork
  publisher: MDN
citation: MDN — PerformanceServerTiming
  type: CreativeWork
  publisher: MDN

Web Specification Studio
type: WebSite

Web Specification Studio
type: Organization

breadcrumb
type: BreadcrumbList
item list element: Home
  type: ListItem
  position: 1
  item: https://webspecification.com/
item list element: Spec
  type: ListItem
  position: 2
  item: https://webspecification.com/spec/
item list element: Performance
  type: ListItem
  position: 3
  item: https://webspecification.com/spec/performance/
item list element: Server-Timing header
  type: ListItem
  position: 4
  item: https://webspecification.com/spec/performance/server-timing/