string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%9C%BA%E5%85%B3%E5%8D%95%E4%BD%8D%E4%BC%9A%E8%AE%AE%E6%B5%81%E7%A8%8B => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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