allErrors := []error{}

	if err := checkForWhiteSpaceOnly("requestheader-username-headers", s.UsernameHeaders...); err != nil {
		allErrors = append(allErrors, err)
	}
	if err := checkForWhiteSpaceOnly("requestheader-group-headers", s.GroupHeaders...); err != nil {
		allErrors = append(allErrors, err)
	}
	if err := checkForWhiteSpaceOnly("requestheader-extra-headers-prefix", s.ExtraHeaderPrefixes...); err != nil {