string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B7%98%E5%AE%9D%E5%93%AA%E9%87%8C%E6%9F%A5%E6%B6%88%E8%B4%B9%E6%80%BB%E8%B4%A6%E5%8D%95%E6%98%8E%E7%BB%86 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
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