string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%B4%B5%E9%98%B3%E6%9C%80%E5%A5%BD%E7%9A%84%E8%81%8C%E6%A0%A1%E6%8E%92%E5%90%8D%E5%88%97%E8%A1%A8%E6%9C%80%E6%96%B0 => Failed to connect to 101.89.117.144 port 38005: Connection refused"
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