string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%8B%B9%E6%9E%9C%E5%AE%98%E7%BD%91%E5%AE%A2%E6%9C%8D%E4%BA%BA%E5%B7%A5%E5%9C%A8%E7%BA%BF%E5%92%A8%E8%AF%A2 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
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