string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BE%8E%E5%A6%86%E5%8C%96%E5%A6%86%E5%93%81%E6%89%B9%E5%8F%91%E7%BD%91%E7%AB%99%E5%93%AA%E4%B8%AA%E5%A5%BD => Failed to connect to 14.18.117.71 port 38041: Connection refused"
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