Programmer XiaoFu

Sep 8, 2025 · Backend Development

Why My Spring Cloud Gateway Returns 404 After Nacos Config Changes – A Year-Long Debugging Tale

The article walks through a year‑long investigation of a 404 error that appears after updating Nacos dynamic routing in Spring Cloud Gateway 3.0.1, explains how stale weight caches cause the failure, and presents a custom event‑listener solution that synchronizes the gateway's weight cache with the latest Nacos configuration.