string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BC%9A%E5%91%98%E6%B4%BB%E5%8A%A8%E7%AD%96%E5%88%92%E6%A1%88%E4%BE%8B => Failed to connect to 101.89.143.195 port 38175: Connection refused"
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