Headroom Daily: Cache Keys, Fail-Closed Proxy, and Gemini Fidelity
Most of today's work targets silent correctness bugs — wrong cache hits, dropped model metadata, and a proxy that kept running when it shouldn't. The pattern is reliability over features, with security and cost accounting implications.
Duration: PT2M30S
Episode overview
This episode is a short developer briefing from Headroom Daily.
It explains recent repository work in plain language.
- Show: Headroom Daily
- Published: 2026-11-12T22:00:35Z
- Audio duration: PT2M30S
Transcript excerpt
This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.
Hello, it's Thursday, November 12th, 2026, and this is Headroom Daily.
Lead insight: The codebase got a correctness pass. Cache keys were colliding, compression was dropping data, and the proxy was failing open when it should have stopped.
First theme: caching you can't trust. Multiple fixes address the same risk — two different requests sharing one cache entry. PR 4799 keeps literal cache-control data inside tool arguments in the key instead of stripping it. PR 4823 keys the OpenAI response cache on voice and format, after one caller's audio reply…
Second theme: a safer, faster proxy. Merged PR 4773 lets a security-critical extension declare itself fail-closed, so a bad OAuth config now stops startup instead of relaying user credentials upstream. Merged PR 4775 strips hop-by-hop connection headers before calling providers. Testing showed a thousand requests…
Finally, Gemini compression is keeping what it used to lose. Merged PR 4777 preserves thinking flags, signatures and tool call IDs through the compress round trip, which had been triggering bad-request errors on Gemini 3. Open PR 4817 extends that to code execution parts and multimodal tool results. Separately, the…
What's next:…
Nearby episodes from Headroom Daily
- Proxy Lockdown and Honest Errors
- Routing Safety and Cache Fidelity
- Fail-Open Plugins and Proxy Corrections
- Cache-Safe Compression and Bedrock Hardening
- Proxy Observability and Hybrid Routing Push
- Silent Compression Failures Fixed, Proxy Hardened
- Fail-Open Proxy, Faithful Compression, Leaner Installs
- Compression Safety and Proxy Hardening