string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%87%AA%E8%B4%B9%E4%B9%B0%E4%BA%94%E9%99%A9%E5%88%92%E7%AE%97%E5%90%97 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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