OpenTween.ShortUrl.ShortenByIsgdAsync C# (CSharp) Метод

        private async Task<Uri> ShortenByIsgdAsync(Uri srcUri)
        {
            // 明らかに長くなると推測できる場合は短縮しない
            if ("http://is.gd/xxxx".Length > srcUri.OriginalString.Length)
                return srcUri;

            var content = new FormUrlEncodedContent(new[]
            {
                new KeyValuePair<string, string>("format", "simple"),
                new KeyValuePair<string, string>("url", srcUri.OriginalString),
            });

            using (var response = await this.http.PostAsync("http://is.gd/create.php", content).ConfigureAwait(false))
            {
                response.EnsureSuccessStatusCode();

                var result = await response.Content.ReadAsStringAsync()
                    .ConfigureAwait(false);

                if (!Regex.IsMatch(result, @"^https?://"))
                    throw new WebApiException("Failed to create URL.", result);

                return new Uri(result.TrimEnd());
            }
        }