staleTtl

PRO

Type:

It enables serve a stale response while a background refresh cache copy is being generated over the target url.

microlink 'https://microlink.io&ttl=1d&staleTtl=0'

The value provided can't be higher than ttl.

A good pattern there is to sets staleTtl=0 to always revalidate in the background under expiration, maximizing the cache usage serving the last cache copy generated while the revalidation will refresh it.