Manual:$wgCdnMaxAge

From Linux Web Expert

<translate> HTTP proxy (CDN) settings</translate>: $wgCdnMaxAge
Cache TTL for the CDN sent as s-maxage (without ESI) or Surrogate-Control (with ESI).
<translate> Introduced in version:</translate>1.34.0 (Gerrit change 387877; git #f9f8dff4)
<translate> Removed in version:</translate><translate> still in use</translate>
<translate> Allowed values:</translate>(integer)
<translate> Default value:</translate>18000

Details

Cache timeout for page view caching, will be sent as s-maxage (without ESI) or Surrogate-Control (with ESI). Without ESI, you should strip out s-maxage in the Cdn config. 18000 seconds = 5 hours, more cache hits with 2678400 = 31 days.

This variable was renamed from $wgSquidMaxage in MediaWiki 1.34.