string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%89%8B%E8%A1%A8%E5%9B%9E%E6%94%B6%E4%BA%A4%E6%98%93%E4%B8%AD%E5%BF%83 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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