string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BB%BA%E5%B7%A5%E7%BD%91%E6%A0%A1%E7%99%BE%E5%BA%A6%E7%99%BE%E7%A7%91 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
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