string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%95%99%E6%B7%B1%E8%BF%87%E5%B9%B4%E8%A1%A5%E8%B4%B4%E5%AE%98%E7%BD%91 => Failed to connect to 125.88.227.171 port 38114: Connection refused"
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