第一次用markdown写博客，体验下

因为常用Http的几种请求方式，总结一下。

1.封装两个Http的最常用方法，叫做HttpHelper类。

HttpPost:

    public static string HttpPost(string Url, string postDataStr){HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);request.Method = "POST";request.ContentType = "application/x-www-form-urlencoded";request.ContentLength = postDataStr.Length;StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.ASCII);writer.Write(postDataStr);writer.Flush();HttpWebResponse response = (HttpWebResponse)request.GetResponse();string encoding = response.ContentEncoding;if (encoding == null || encoding.Length < 1){encoding = "UTF-8"; //默认编码  }StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(encoding));string retString = reader.ReadToEnd();return retString;}

HttpGet:

    public static string HttpGet(string Url){HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);request.Method = "GET";request.ContentType = "text/html;charset=UTF-8";HttpWebResponse response = (HttpWebResponse)request.GetResponse();Stream myResponseStream = response.GetResponseStream();StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);string retString = myStreamReader.ReadToEnd();myStreamReader.Close();myResponseStream.Close();return retString;}

WebClientde中Post和Get:

    //Postusing (var client = new WebClient()){client.Headers[HttpRequestHeader.ContentType] = "application/json";client.Encoding = Encoding.UTF8;result = client.UploadString(postUrl, "POST", postData);}//Get var wc = new WebClient();var jsonResult = wc.DownloadString(Url);

封装好Http的方法，直接传入Url和postData即可，不必每次创建request对象。

更新：the remote server returned an error (401) unauthorized

    var req = (HttpWebRequest)WebRequest.Create(tgtUrl);req.UseDefaultCredentials = true;req.PreAuthenticate = true;req.Credentials = CredentialCache.DefaultCredentials;var response = req.GetResponse();var stream = req.GetRequestStream();var wc = new WebClient();//Set default credential, avoid unauthorize errorwc.Credentials = CredentialCache.DefaultCredentials;wc.UseDefaultCredentials = true;