public static async Task <IEnumerable <string> > JsonBodyToEncodedParameterStrings(
     [NotNull] this IOwinRequest owinRequest
     )
 {
     return((await owinRequest.JsonBodyToMap()).Select(
                parameter =>
                $"{HttpUtility.UrlEncode((string) parameter.Key)}={HttpUtility.UrlEncode((string) parameter.Value)}"
                ));
 }