/// <summary>
/// Try to get the first value from the specified header name.
/// </summary>
/// <param name="self">The headers.</param>
/// <param name="name">The header's name.</param>
/// <param name="value">The value.</param>
/// <returns></returns>
public static bool TryGetValue(this HttpHeaders self, string name, out string value)
{
value = null;
return(self.TryGetValues(name, out IEnumerable <string> values) &&
(value = values?.FirstOrDefault()) != null);
}