string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B7%98%E7%AE%A1%E5%AE%B6%E6%89%8B%E6%9C%BA%E5%8F%AF%E4%BB%A5%E5%8F%91%E8%B4%A7%E5%90%97 => Failed to connect to 14.18.117.71 port 38093: Connection refused"
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