string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B7%98%E6%B0%94%E5%80%BC%E4%B8%8A%E9%99%90%E6%98%AF%E5%A4%9A%E5%B0%91 => Failed to connect to 101.89.143.195 port 38109: Connection refused"
淘气值上限是多少
