phb📎

Policy Handled Backoff go library, zero dependencies. It is general purpose. The original use case was a simple and performant (enough) way for http servers to easily set per user API limits.

Tests📎

Given the high amounts of concurrency, it is recommended to run tests with the race detector enabled (requires CGO_ENABLED=1 as of July 2026)

CGO_ENABLED=1 go test -race -v -count=1 ./...