string(292) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%A1%BA%E4%B8%B0%E5%BF%AB%E9%80%92%E4%B8%8A%E9%97%A8%E5%8F%96%E4%BB%B6%E5%AF%84%E4%BB%B6%E5%AE%A2%E6%9C%8D%E7%94%B5%E8%AF%9D => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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