HttpWebRequest访问HTTPS信息时，需要设置SSL3安全协议

笒羽

1. HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(Url);
   
2. 
   
3. ……
   
4. 
   
5. ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
   
6. ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
   
7. 
   
8. ……

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