string(242) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2000%E5%85%83%E9%A2%9C%E5%80%BC%E6%9C%80%E9%AB%98%E7%9A%84%E6%89%8B%E6%9C%BA => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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