string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AA%E4%BD%93%E6%88%B7%E5%BC%80%E6%8A%96%E9%9F%B3%E5%B0%8F%E5%BA%97%E4%BF%9D%E8%AF%81%E9%87%91 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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