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The pinned URL pattern (https://caido.download/releases/v<X>/caido-cli-v<X>-linux-<arch>.tar.gz) is canonical — it's published by api.caido.io/releases/latest. HEAD requests return 404 because the upstream R2 bucket only honors GET-with-redirect, but the wget call in the Dockerfile uses GET so the original URL was never actually broken — it was just stale. Switch to an ARG so future bumps are a single --build-arg override. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>