string(292) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%95%86%E5%AE%B6%E6%9C%80%E6%80%95%E4%BB%80%E4%B9%88%E6%8A%95%E8%AF%89%E6%89%8D%E4%BC%9A%E8%B5%94%E5%81%BF%E9%A1%BE%E5%AE%A2 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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