string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%91%A9%E6%89%98%E7%BD%97%E6%8B%89%E6%89%8B%E6%9C%BA%E6%8E%A8%E8%8D%90 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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