string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B5%8E%E5%8D%97%E8%8D%B7%E6%82%A6%E9%85%92%E5%BA%97%E9%A4%90%E9%A5%AE => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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