I'm changing a bit how the expiration time is stored on a cache entry to allow calculation of the stale window for most cases it can be calculated (like max-age=0), let's see how the try push goes: https://treeherder.mozilla.org/#/jobs?repo=try&revision=28197d0563dd276a7d66b5d7526f23f501f3fdd2
Bug 1536511 Comment 3 Edit History
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I'm changing a bit how the expiration time is stored on a cache entry to allow calculation of the stale window for most cases it can be calculated (like max-age=0), let's see how the try push goes https://treeherder.mozilla.org/#/jobs?repo=try&revision=faa68e55f71d9b1fb7b32c66985aafbc37327f48