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func safeHandler(fn http.HandlerFunc) http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        defer func() {
            if e, ok := recover().(error); ok {
                http.Error(w, e.Error(), http.StatusInternalServerError)
                log.Printf("WARN: panic in %v -%v", fn, e)
                log.Println(string(debug.Stack()))
            }
        }()
        fn(w, r)
    }
}