Top Architect
Mar 6, 2022 · Backend Development
Resolving Duplicate Access‑Control‑Allow‑Origin Header Issues in Spring Cloud Gateway
This article explains why Spring Cloud Gateway can return duplicate Access‑Control‑Allow‑Origin and Vary headers during CORS handling, analyzes the underlying processing flow, and provides two practical solutions—using DedupeResponseHeader configuration or implementing a custom GlobalFilter—to ensure a single, correct header is sent to the client.
BackendCORSJava
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