string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%80%8E%E4%B9%88%E6%A0%B7%E6%89%BE%E4%BA%BA%E6%8A%95%E8%B5%84%E6%88%91 => Failed to connect to 14.18.117.71 port 38093: Connection refused"
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