string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B0%8F%E5%90%83%E9%85%8D%E6%96%B9%E6%8A%80%E6%9C%AF%E5%AE%98%E7%BD%91 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
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