string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%87%8E%E7%94%9F%E7%8D%BE%E5%AD%90%E5%9B%BE%E7%89%87%E5%A4%A7%E5%85%A8 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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