string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E5%9B%BD%E5%A5%BD%E5%A3%B0%E9%9F%B3%E8%8E%AB%E5%B0%BC%E5%B1%B1 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
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