OpenTween.ShortUrl.ShortenByBitlyAsync C# (CSharp) Метод

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

            // bit.ly 短縮機能実装のプライバシー問題の暫定対応
            // ログインIDとAPIキーが指定されていない場合は短縮せずにPOSTする
            // 参照: http://sourceforge.jp/projects/opentween/lists/archive/dev/2012-January/000020.html
            if (string.IsNullOrEmpty(this.BitlyId) || string.IsNullOrEmpty(this.BitlyKey))
                return srcUri;

            var query = new Dictionary<string, string>
            {
                ["login"] = this.BitlyId,
                ["apiKey"] = this.BitlyKey,
                ["format"] = "txt",
                ["domain"] = domain,
                ["longUrl"] = srcUri.OriginalString,
            };

            var uri = new Uri("https://api-ssl.bitly.com/v3/shorten?" + MyCommon.BuildQueryString(query));
            using (var response = await this.http.GetAsync(uri).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());
            }
        }