string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BE%AE%E4%BF%A1%E5%85%AC%E4%BC%97%E5%8F%B7%E5%AE%A2%E6%9C%8D%E5%9C%A8%E7%BA%BF%E5%92%A8%E8%AF%A2 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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