string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BB%BA%E7%AD%91%E4%B9%A6%E5%BA%97%E7%BD%91%E4%B8%8A%E8%B4%AD%E4%B9%A6 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
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