Asp.Net中的HttpWebRequest类与HttpWebResponse类

相关博文：https://www.cnblogs.com/xu-yi/p/10061342.html

相关博文：https://www.cnblogs.com/zoujinhua/p/11313396.html

HttpWebRequest类：提供支持的属性和方法中定义WebRequst以及其他属性和方法，使用户直接通过 HTTP 与服务器交互。

HttpWebResponse类：用于生成 HTTP 独立客户端应用程序发送 HTTP 请求和接收 HTTP 响应。

public static string GetRequest(string serviceAddress, string strContent)
        {
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(serviceAddress);
                request.Method = "POST";
                request.ContentType = "application/json";

                using (StreamWriter dataStream = new StreamWriter(request.GetRequestStream()))
                {
                    dataStream.Write(strContent);
                    dataStream.Close();
                }
                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;
            }
            catch (Exception e)
            {
                return "error，请求外API服务时发生异常，错误描述：" + e.Message;
            }

        }