2022-07-26-mark-http-cache-as-stale-instead-deleting.md

title	issue
Mark http cache as stale instead deleting	NEXT-22576

Storefront

• Added two config options to set stale-while-revalidate and stale-if-error for storefront.http_cache
  • Both additional header fields are for external reverse proxy caching and will be not used internally by the Symfony http cache component.