string(292) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%9D%99%E8%9D%A0%E4%BE%A0%E6%89%80%E6%9C%89%E7%9A%84%E7%94%B5%E5%BD%B1%E5%A4%A7%E5%85%A8%E5%85%8D%E8%B4%B9%E8%A7%82%E7%9C%8B => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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