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New ResolverCache interface in JobContext allows build jobs to memorize and synchronize accesses to mutable remote resources. This is to make sure that when multiple parts of the same build job, or build job and source metadata resolver access the same remote resources, it remains the same for the duration of the single build request, even if data happens to change on the remote side. Fix such a possible case in the HTTP source. Even if the server now returns completely different data, if the same URL was accessed once for the ongoing build, then the initial contents are always used until the build completes. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>