string(294) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%90%8E%E8%A1%97%E7%94%B7%E5%AD%A9%E6%AD%8C%E6%9B%B2%E5%A4%A7%E5%85%A8%E5%85%8D%E8%B4%B9%E5%90%AC%E5%AE%8C%E6%95%B4%E7%89%88 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
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