Cache-Control

Baseline

20157

HTTP Cache-Control CDN

	,

CORS

http

Cache-Control: <>, <>, ...

Cache-control: max-age=180, public
(=) Cache-control: max-age=12

Cache-Control


`max-age`	`max-age`
`max-stale`	-
`min-fresh`	-
-	`s-maxage`
`no-cache`	`no-cache`
`no-store`	`no-store`
`no-transform`	`no-transform`
`only-if-cached`	-
-	`must-revalidate`
-	`proxy-revalidate`
-	`must-understand`
-	`private`
-	`public`
-	`immutable`
-	`stale-while-revalidate`
`stale-if-error`	`stale-if-error`

(HTTP)
: Proxy, CDN 1






Age

`max-age`

max-age=N N

http

Cache-Control: max-age=604800

max-age 100 Age 100

max-age -1 3599.99 0 HTTP

http

Cache-Control: max-age=604800
Age: 100

`s-maxage`

s-maxage (max-age ) s-maxage max-age max-age

http

Cache-Control: s-maxage=604800

`no-cache`

no-cache

http

Cache-Control: no-cache

no-cache

no-cache no-store

`must-revalidate`

must-revalidate

must-revalidate max-age

http

Cache-Control: max-age=604800, must-revalidate

HTTP must-revalidate 504 (Gateway Timeout)

`proxy-revalidate`

proxy-revalidate must-revalidate

`no-store`

no-store

http

Cache-Control: no-store

`private`

private

http

Cache-Control: private

Cookie private

private

`public`

public Authorization public

http

Cache-Control: public

Basic Digest Authorization max-age

public

http

Cache-Control: public, max-age=604800

s-maxage must-revalidate

Authorization s-maxage must-revalidate public

`must-understand`

must-understand

must-understand no-store

http

Cache-Control: must-understand, no-store

must-understand no-store

must-understand

`no-transform`

(intermedialies)

no-transform

`immutable`

immutable

http

Cache-Control: public, max-age=604800, immutable

/ URL /URL cache-busting

html

<script src="https://example.com/react.0.0.0.js"></script>

immutable

cache-busting max-age immutable

`stale-while-revalidate`

stale-while-revalidate

http

Cache-Control: max-age=604800, stale-while-revalidate=86400

7 604800 7 86400

`stale-if-error`

stale-if-error 500502503504

http

Cache-Control: max-age=604800, stale-if-error=86400

7 604800 7 1 86400

stale-if-error

`no-cache`

no-cache

http

Cache-Control: no-cache

no-cache

`no-store`

no-store

http

Cache-Control: no-store

`max-age`

max-age=N N N 0

http

Cache-Control: max-age=10800

Cache-Control: max-age=10800 3 max-age Age

http

Cache-Control: max-age=0

max-age=0 no-cache (HTTP/1.0 ) no-cache max-age=0 no-cache

max-age -1 3599.99 0

`max-stale`

max-stale=N N N

http

Cache-Control: max-stale=3600

max-stale

`min-fresh`

min-fresh N

http

Cache-Control: min-fresh=600

51 Cache-Control: max-age=3600

min-fresh

`no-transform`

no-transform

`only-if-cached`

504 Gateway Timeout

`stale-if-error`

stale-if-error

no-store

http

Cache-Control: no-store

no-cache

http

Cache-Control: no-cache

private, no-cache, max-age=0, must-revalidate no-store

http

# 
Cache-Control: private, no-cache, no-store, max-age=0, must-revalidate

# 
Cache-Control: no-store

html

<!-- index.html -->
<script src="/assets/react.min.js"></script>
<img src="/assets/hero.png" width="900" height="400" />

React hero.png max-age

URL

html

<!-- index.html -->
<script src="/assets/react.0.0.0min.js"></script>
<img src="/assets/hero.png?hash=deadbeef" width="900" height="400" />

max-age immutable

http

# /assets/*
Cache-Control: max-age=31536000, immutable

URL

no-cache HTML no-cache HTML

http

# /index.html
Cache-Control: no-cache

: index.html Basic Digest /assets /assets/ publics-maxage must-revalidate 1

Cache-Control Cache-Control

no-cache 304 Not Modified

http

Cache-Control: no-cache

HTTP/1.0 no-cache max-age=0 max-age=0 must-revalidate no-cache

http

Cache-Control: max-age=0, must-revalidate

no-cache

Clear-Site-Data: cache


HTTP Caching # field.cache-control
HTTP Immutable Responses # the-immutable-cache-control-extension

MDN

MDN 2026412

GitHub