.net post 模拟登录提交 获取 cookie

 string url = "https://www.baidu.com";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            string postdata = "phone=111111&password=2222222";
            byte[] requestBytes = System.Text.Encoding.UTF8.GetBytes(postdata);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            req.ContentLength = requestBytes.Length;
            req.Referer = "https://www.xxx.com";
            Stream requestStream = req.GetRequestStream();
            requestStream.Write(requestBytes, 0, requestBytes.Length);
            requestStream.Close();
            HttpWebResponse res = (HttpWebResponse)req.GetResponse();
            StreamReader sr = new StreamReader(res.GetResponseStream(), System.Text.Encoding.UTF8);
            string backstr = sr.ReadToEnd();
            //Response.Write(backstr);
            sr.Close();
            res.Close();

            string cookiestr = res.Headers.Get("Set-Cookie");//获取Cookie

            //foreach (Cookie coo in res.Cookies)
            //    Response.Write(coo.Name + "==" + coo.Value + "<br/>");

            string aaa = "";
            foreach (Cookie coo in res.Cookies)
            {
                aaa += coo.Value + ",";
            }

            //显示"登录"
            return backstr + "-----------------------------------------------------------------" + aaa;

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