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This fix resolves an issue where cached images required upstream registry availability to be pulled, defeating the purpose of the proxy cache feature. Problem: - The _update_manifest_for_tag() method always contacted the upstream registry via manifest_exists() HTTP HEAD request - When upstream registry was unavailable, pulls failed with 504 timeout - This occurred even when the manifest and blobs were fully cached Solution: - Add early return that serves from cache when: 1. Tag is not expired (still within TTL) 2. Manifest is not a placeholder (has full content) - Only contact upstream when tag expired or manifest incomplete - Reduces upstream traffic and improves availability Benefits: - Cached images work when upstream unavailable - Reduced upstream registry traffic - Lower latency for cached pulls - True proxy cache behavior (cache-first) Fixes: https://issues.redhat.com/browse/PROJQUAY-8440 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>