string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BE%AE%E4%BF%A1%E6%94%AF%E4%BB%98%E5%95%86%E5%AE%B6%E4%BC%98%E6%83%A0 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
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