/// <summary>
/// Plan to navigate to an action using the specified method with the given
/// entity body of the mime type.
/// http://www.w3.org/html/wg/drafts/html/master/forms.html#plan-to-navigate
/// </summary>
/// <param name="context">The browsing context.</param>
/// <param name="request">The request to issue.</param>
/// <param name="cancel"></param>
/// <returns>A task that will eventually result in a new document.</returns>
internal static Task <IDocument> NavigateToAsync(this IBrowsingContext context, DocumentRequest request, CancellationToken cancel = default)
{
var handler = context.GetNavigationHandler(request.Target);
return(handler?.NavigateAsync(request, cancel) ?? Task.FromResult <IDocument>(null));
}