使用HttpWebRequest进行请求时发生错误：基础连接已关闭，发送时

最近调试原来的微信模拟登陆时发生了“基础连接已关闭，，发送时发生错误”的错误提示，原来都是好好的，只是很久没用了。

出错代码如下：

HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("https://mp.weixin.qq.com/cgi-bin/loginpage?t=wxm2-login&lang=zh_CN");///cgi-bin/loginpage?t=wxm2-login&lang=zh_CNreq.CookieContainer = cookie;req.Method = "GET";req.ProtocolVersion = HttpVersion.Version10;HttpWebResponse res = (HttpWebResponse)req.GetResponse();StreamReader rd = new StreamReader(res.GetResponseStream());string theContent = rd.ReadToEnd();

经过一番Google和试验，答案既如此简单，增加如下一句：

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;通过代码如下：

HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("https://mp.weixin.qq.com/cgi-bin/loginpage?t=wxm2-login&lang=zh_CN");///cgi-bin/loginpage?t=wxm2-login&lang=zh_CN

req.CookieContainer = cookie;req.Method = "GET";req.ProtocolVersion = HttpVersion.Version10;ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;HttpWebResponse res = (HttpWebResponse)req.GetResponse();StreamReader rd = new StreamReader(res.GetResponseStream());string theContent = rd.ReadToEnd();

记录一下，以防后错！

既有美妙的风景，也会有称不上景、只有风的地方。