string(292) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%BB%E6%AE%96%E4%B8%9A%E4%BB%80%E4%B9%88%E6%9C%80%E8%B5%9A%E9%92%B1%E5%86%9C%E6%9D%91%E7%9B%B8%E5%85%B3%E6%8E%A8%E8%8D%90 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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