"We're currently working on a programmatic solution for invalidation. We respect max-age headers for deciding when to refetch a page, but will keep serving the

"We're currently working on a programmatic solution for invalidation. We respect max-age headers for deciding when to refetch a page, but will keep serving the last known version until we have done so." https://github.com/ampproject/amphtml/issues/1901 https://github.com/ampproject/amphtml/issues/1901