string(256) "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%E5%95%86%E5%AE%B6%E5%BA%97%E9%93%BA%E6%80%8E%E4%B9%88%E5%BC%80%E5%BA%97 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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