No-Vary-Search response header
type: TechArticle
description: The `No-Vary-Search` response header tells browsers and caches that some URL query parameters (tracking, UTM, sort order) do not change the response. The cached entry for the canonical URL is reused for variants — fewer fetches, better prefetch hits, less duplicate work.
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: 2026-07-09T00:00:00.000Z
citation: No-Vary-Search — WICG editor's draft
  type: CreativeWork
  publisher: WICG
citation: MDN — No-Vary-Search
  type: CreativeWork
  publisher: MDN
citation: Chrome Status — No-Vary-Search
  type: CreativeWork
  publisher: Google

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: No-Vary-Search response header
  type: ListItem
  position: 4
  item: https://webspecification.com/spec/performance/no-vary-search/