Discover how the #AWS team eliminated a hidden, high-latency pre-flight round…

InfoQ@techhub.social · 2026-07-16 15:04

Discover how the #AWS team eliminated a hidden, high-latency pre-flight round trip in a multi-region API by moving from SigV4 to SigV4a.

The change removed the need for clients to pre-discover which region to sign for, improving both latency & regional failover resiliency.

The code change was small - the 6-month rollout wasn't.

📰 Read the #InfoQ article by Suresh Gururajan: https://bit.ly/4yqaA7W

#CloudComputing #CloudArchitecture #APISecurity #Authentication #LowLatency

Removing a Hidden Round Trip from a Multi-Region AWS API

When a series of regional outages forced a rethink of a multi-region AWS API, the team discovered that an obstacle to global failover was hiding in plain sight: a pre-flight discovery call baked into every client session years earlier as the only available option. This article describes what it took to remove it, and what the rollout actually cost.

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