string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B9%BF%E5%91%8A%E5%BA%97%E5%BC%80%E4%B8%9A%E6%80%8E%E4%B9%88%E5%8F%91%E6%9C%8B%E5%8F%8B%E5%9C%88%E5%AE%A3%E4%BC%A0 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
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