string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%96%B0%E9%97%BB%E5%AA%92%E4%BD%93%E5%8F%91%E5%B8%83%E5%B9%B3%E5%8F%B0 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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