string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%8D%E5%88%BB%E6%89%8B%E8%A1%A8%E8%B4%AD%E4%B9%B0%E7%BD%91%E7%AB%99 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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