string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%AB%98%E9%93%81%E7%A5%A8%E6%94%B9%E7%AD%BE%E6%89%A3%E8%B4%B9%E5%90%97 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
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