string(294) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BE%AE%E4%BF%A1%E5%85%AC%E4%BC%97%E5%8F%B7%E6%80%8E%E4%B9%88%E5%BC%80%E9%80%9A%E7%AE%A1%E7%90%86%E5%91%98%E6%9D%83%E9%99%90 => Failed to connect to 101.89.166.210 port 38089: Connection refused"
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