Qiniu.Http.HttpManager.get C# (CSharp) Method

        public void get(string pUrl, Dictionary<string, string> pHeaders,
            CompletionHandler pCompletionHandler)
        {
            HttpWebRequest vWebReq = null;
            HttpWebResponse vWebResp = null;
            try
            {
                vWebReq = (HttpWebRequest)WebRequest.Create(pUrl);
            }
            catch(WebException wexp)
            {
                // FIX-HTTP 4xx/5xx Error 2016-11-22, 17:00 @fengyh
                HttpWebResponse xWebResp = wexp.Response as HttpWebResponse;
                handleErrorWebResponse(xWebResp, pCompletionHandler, wexp);
            }
            catch (Exception ex)
            {
                if (pCompletionHandler != null)
                {
                    pCompletionHandler(ResponseInfo.invalidRequest(ex.Message), "");
                }
                return;
            }

            try
            {
                vWebReq.AllowAutoRedirect = false;
                vWebReq.Method = "GET";
                vWebReq.UserAgent = this.getUserAgent();
                if (pHeaders != null)
                {
                    foreach (KeyValuePair<string, string> kvp in pHeaders)
                    {
                        if (!kvp.Key.Equals("Content-Type"))
                        {
                            vWebReq.Headers.Add(kvp.Key, kvp.Value);
                        }
                    }
                }

                //fire request
                vWebResp = (HttpWebResponse)vWebReq.GetResponse();
                handleWebResponse(vWebResp, pCompletionHandler);
            }
            catch (WebException wexp)
            {
                // FIX-HTTP 4xx/5xx Error 2016-11-22, 17:00 @fengyh
                HttpWebResponse xWebResp = wexp.Response as HttpWebResponse;
                handleErrorWebResponse(xWebResp, pCompletionHandler, wexp);
            }
            catch (Exception exp)
            {
                handleErrorWebResponse(vWebResp, pCompletionHandler, exp);
            }
            finally
            {
                if(vWebResp!=null)
                {
                    vWebResp.Close();
                    vWebResp = null;
                }

                if(vWebReq!=null)
                {
                    vWebReq.Abort();
                    vWebReq = null;
                }
            }
        }

 public void reqGetTest()
 {
     HttpManager target = new HttpManager();
     string url = "http://ip.taobao.com/service/getIpInfo.php?ip=100.123.199.44";
     Dictionary<string, string> pHeaders = new Dictionary<string, string>();
     pHeaders.Add("X-Reqid", "TestReqId");
     CompletionHandler pCompletionHandler = new CompletionHandler(delegate(ResponseInfo respInfo, string response)
     {
         Assert.AreEqual(respInfo.StatusCode, 200);
     });
     target.get(url, pHeaders, pCompletionHandler);
 }