string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BE%81%E9%B8%BF%E6%B3%A8%E4%BC%9A%E8%B4%A2%E7%AE%A1%E7%99%BE%E5%BA%A6%E4%BA%91 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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