string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E5%86%8C%E7%A8%8E%E5%8A%A1%E5%B8%88%E6%8A%A5%E8%80%83%E6%97%B6%E9%97%B4 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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