string(292) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8A%95%E8%AF%89%E5%95%86%E5%AE%B6%E4%BC%9A%E6%9C%89%E8%B5%94%E5%81%BF%E9%87%91%E5%90%97%E7%9F%A5%E4%B9%8E%E6%96%87%E7%AB%A0 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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