string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E5%AE%89%E5%B8%88%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E8%80%83%E8%AF%95%E5%95%8A%E7%9F%A5%E4%B9%8E => Failed to connect to 14.18.117.71 port 38164: Connection refused"
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