private static void CheckReceivedBy(string receivedBy)
{
if (string.IsNullOrEmpty(receivedBy))
{
throw new ArgumentException(SR.net_http_argument_empty_string, nameof(receivedBy));
}
// 'receivedBy' can either be a host or a token. Since a token is a valid host, we only verify if the value
// is a valid host.
string host = null;
if (HttpRuleParser.GetHostLength(receivedBy, 0, true, out host) != receivedBy.Length)
{
throw new FormatException(string.Format(System.Globalization.CultureInfo.InvariantCulture, SR.net_http_headers_invalid_value, receivedBy));
}
}
}