string(266) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E6%96%87%E5%8D%81%E5%A4%A7%E6%8E%92%E8%A1%8C%E6%A6%9C%E5%B0%8F%E8%AF%B4%E6%8E%A8%E8%8D%90 => Failed to connect to 101.89.120.29 port 38104: Connection refused"
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