string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%90%9C%E7%B4%A2%E6%9B%B4%E5%A4%9A%E5%BE%AE%E4%BF%A1%E7%99%BE%E5%BA%A6%E6%80%8E%E4%B9%88%E5%88%A0%E9%99%A4 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
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