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Support fetching CAS objects via the Bazel HTTP caching protocol (enables CDN-backed remote storage) #2165

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Support fetching CAS objects via the Bazel HTTP caching protocol (enables CDN-backed remote storage)#2165
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cache serverIssue related to cache server interactionsenhancementNew feature or request
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BuildStream 2.9

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@jjardon
jjardon
opened on Aug 10, 2026

BuildStream relies on buildbox-casd for all CAS access. The gRPC REAPI CAS protocol is efficient for low-latency environments but is difficult to put behind a standard CDN

Upstream work to add client-side support for this protocol as a remote in buildbox-casd's proxy mode is tracked here:
https://gitlab.com/BuildGrid/buildbox/buildbox/-/work_items/201

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