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Some registries (e.g. ECR Public) reject HEAD requests on blob endpoints regardless of authentication. Retry with GET in that case to still verify blob existence.
Assisted By: Claude Opus 5 Some registries reject HEAD on blob endpoints regardless of auth (public.ecr.aws answers 401 where the same token succeeds on GET), which surfaced as a 502 on pull-through. Fall back to a GET with Range: bytes=0-0 on 401/405. Those responses carry no docker-content-digest, so the digest check is skipped there; the sha256 is still verified on the actual download.
Assisted By: Claude Opus 5 extra_data["headers"] is usually the V2_ACCEPT_HEADERS constant, and headers.update(auth_headers) mutated it in place. The first token negotiated in a process leaked into every later request, including those to other registries.
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