/// <summary>
/// Submits the given form by using the dictionary which contains name
/// value pairs of input fields to submit.
/// </summary>
/// <param name="form">The form to submit.</param>
/// <param name="fields">The fields to use as values.</param>
/// <param name="createMissing">
/// What to do if some field(s) have not been found in the form. If
/// true, then new input will be created. Otherwise, an exception will
/// be thrown.
/// </param>
/// <returns>The task eventually resulting in the response.</returns>
public static Task <IDocument> SubmitAsync(this IHtmlFormElement form, IDictionary <String, String> fields, Boolean createMissing = false)
{
form.SetValues(fields, createMissing);
return(form.SubmitAsync());
}