string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%B4%B5%E9%98%B3%E6%9C%80%E5%A5%BD%E7%9A%84%E8%81%8C%E4%B8%AD%E6%8E%92%E5%90%8D => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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