string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%9A%E9%A9%AC%E9%80%8A%E5%8D%96%E5%AE%B6%E4%BB%98%E6%AC%BE%E5%90%8E%E5%A4%9A%E4%B9%85%E5%88%B0%E8%B4%A6 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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