string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%B4%E6%9D%A1%E6%96%B0%E9%97%BB%E5%AE%98%E7%BD%91%E5%85%A5%E5%8F%A3 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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