HTTP/2
Go and ENHANCE_YOUR_CALM: Resolving HTTP/2 Interoperability Issues
Investigating the `ENHANCE_YOUR_CALM` Mystery in HTTP/2 In September 2025, a question appeared in our internal engineering chat: > "Which part of our stack would be responsible for sending `ErrCode=ENHANCE_YOUR_CALM` to an HTTP/2 client?" Two microservices were hitting a critical communication failure,