string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%B4%9D%E8%8E%B1%E5%BE%B7%E9%9B%86%E5%9B%A2%E5%85%AC%E5%8F%B8%E5%B8%82%E5%80%BC => Failed to connect to 14.18.117.71 port 38041: Connection refused"
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