string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E8%80%83%E8%AF%95%E7%A7%91%E7%9B%AE%E9%A2%98%E5%BA%93 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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