string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%9C%80%E6%96%B0%E5%95%86%E4%B8%9A%E5%85%BB%E8%80%81%E4%BF%9D%E9%99%A9 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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