string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8A%95%E8%AF%89%E5%95%86%E5%AE%B6%E9%80%80%E6%AC%BE%E8%83%BD%E5%88%B0%E5%90%97 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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