string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BC%A6%E6%95%A6%E5%A5%A5%E8%BF%90%E5%BC%80%E5%B9%95%E6%86%A8%E8%B1%86 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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