string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%9B%B4%E6%92%AD%E9%97%B4%E4%B8%BB%E6%92%AD%E6%80%8E%E4%B9%88%E6%89%93%E5%AD%97%E8%81%8A%E5%A4%A9 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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