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7679452caf
In some places we prevented cache poisoning, in others we did not. We also did not place any restriction on the minimum value for a revision. This change introduces a new set of functions for configonly endpoints which validates the revision numbers passed in. If the revision is either too old, or too new, it is rejected and the file content is not cached. The content is still served, but caching headers are not sent, and any local storage caching is prevented. The current time is used as the maximum version, with 60 seconds added to allow for any clock skew between cluster nodes. Previously some locations used one hour, but there should never be such a large clock skew on a correctly configured system. Co-authored-by: Andrew Nicols <andrew@nicols.co.uk>