func ReadHTTP(url string) ([]byte, error) {
	var err error
	retryDelay := time.Duration(2) * time.Second
	for retryCount := 0; retryCount < 5; retryCount++ {
		if retryCount > 0 {
			time.Sleep(retryDelay)
			retryDelay *= time.Duration(2)
		}

		resp, err := http.Get(url)
		if resp != nil && resp.StatusCode >= 500 {
			// Retry on this type of error.
			continue
		}
		if err != nil {
			return nil, err
		}
		defer resp.Body.Close()

		body, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			continue
		}
		return body, nil
	}
	return nil, fmt.Errorf("ran out of retries reading from '%s'. Last error was %v", url, err)
}
func ReadHTTP(url string) ([]byte, error) {
	var err error
	retryDelay := time.Duration(2) * time.Second
	for retryCount := 0; retryCount < 5; retryCount++ {
		if retryCount > 0 {
			time.Sleep(retryDelay)
			retryDelay *= time.Duration(2)
		}

		resp, err := http.Get(url)
		if resp != nil && resp.StatusCode >= 500 {
			// Retry on this type of error.
			continue
		}
		if err != nil {
			return nil, err
		}
		defer resp.Body.Close()

		body, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			continue
		}
		return body, nil
	}
	return nil, fmt.Errorf("ran out of retries reading from '%s'. Last error was %v", url, err)
}
// ReadHTTP fetches file contents from a URL with retries.