string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B1%BD%E4%BF%AE%E9%97%A8%E5%BA%97%E7%AE%A1%E7%90%86%E6%B5%81%E7%A8%8B => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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