c#, google

public string urlShorter(string url)
        {
            string finalURL = "";
            string post = "{\"longUrl\": \"" + url + "\"}";
            string shortUrl = url;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://www.googleapis.com/urlshortener/v1/url?key=" + key);
                request.ServicePoint.Expect100Continue = false;
                request.Method = "POST";
                request.ContentLength = post.Length;
                request.ContentType = "application/json";
                request.Headers.Add("Cache-Control", "no-cache");
                using (Stream requestStream = request.GetRequestStream())
                {
                    byte[] postBuffer = Encoding.ASCII.GetBytes(post);
                    requestStream.Write(postBuffer, 0, postBuffer.Length);
                }
                using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
                {
                    using (Stream responseStream = response.GetResponseStream())
                    {
                        using (StreamReader responseReader = new StreamReader(responseStream))
                        {
                            string json = responseReader.ReadToEnd();
                            finalURL = Regex.Match(json, @"""id"": ?""(?.+)""").Groups["id"].Value;
                        }
                    }
                }
            
           
            return finalURL;
        }

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