/// <summary>
/// Gets a <see cref="SecurityToken"/> for the given audience and duration.
/// </summary>
/// <param name="appliesTo">The URI which the access token applies to</param>
/// <param name="timeout">The time span that specifies the timeout value for the message that gets the security token</param>
public Task <SecurityToken> GetTokenAsync(string appliesTo, string action, TimeSpan timeout)
{
TimeoutHelper.ThrowIfNegativeArgument(timeout);
appliesTo = this.NormalizeAppliesTo(appliesTo);
return(this.OnGetTokenAsync(appliesTo, action, timeout));
}