kubernetes/staging/src/k8s.io/apiserver/pkg/endpoints/filters/audit_init.go

// WithAuditInit initializes the audit context and attaches the Audit-ID associated with a request.
//
// a. If the caller does not specify a value for Audit-ID in the request header, we generate a new audit ID
// b. We echo the Audit-ID value to the caller via the response Header 'Audit-ID'.
func WithAuditInit(handler http.Handler) http.Handler { … }

func withAuditInit(handler http.Handler, newAuditIDFunc func() string) http.Handler { … }