有意思的案例：\r\n的问题

https://www.cnblogs.com/xiaotiannet/p/3510586.html

https://social.msdn.microsoft.com/Forums/en-US/1358368f-e323-4cf0-bc58-6c935597cb22/wcf-client-strips-carriage-return-r-from-dataset-response

https://stackoverflow.com/questions/2221545/wcf-stream-parameter-is-missing-cr-of-crlf

笔误写成\n\r

\n\r被bug转为\n\n

如果是\n\r\n\r会变成\n\n\n