Discussion on: API Design: Errors

func WithRetry(req *http.Request) (*http.Response, error)  {
    res, err := http.DefaultClient.Do(req) // or pass a client here
    if err != nil {
        if IsRetryable(err) {
            // retry
        } else {
            // bail
        }
    }
    return res, nil
}

func main() {
    req, err := http.NewRequest("GET", "https://example.com", nil)
    if err != nil {
        fmt.Fprintln(os.Stderr, err.Error())
        os.Exit(1)
    }
    res, err := WithRetry(req)
    ...
}