string(294) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%89%AA%E8%BE%91%E7%94%B5%E8%A7%86%E5%89%A7%E8%A7%86%E9%A2%91%E7%89%87%E6%AE%B5%E4%BE%B5%E7%8A%AF%E7%89%88%E6%9D%83%E4%B9%88 => Failed to connect to 101.89.143.195 port 38205: Connection refused"
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