向指定url发送请求与获取响应

 ???????????string url = @"https://www.baidu.com"; ???????????//向指定服务器发起请求 ???????????HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url); ???????????//request.Proxy = null; ???????????HttpWebResponse response = (HttpWebResponse)request.GetResponse(); ???????????//获取响应内容长度 ???????????long contentLength = response.ContentLength; ???????????//获取响应内容格式 ???????????string contentType = response.ContentType; ???????????//获取服务器返回的响应流 ???????????Stream receiveStream = response.GetResponseStream(); ???????????//使用指定的编码创建文本读取流 ???????????StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8); ???????????//读取响应内容 ???????????string contentText = readStream.ReadToEnd(); ???????????//关闭流 ???????????response.Close(); ???????????readStream.Close();