string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%96%B0%E4%BA%BA%E4%B8%BB%E6%92%AD%E5%BF%85%E5%A4%87%E8%81%8A%E5%A4%A9%E8%AF%9D%E9%A2%98%E5%A4%A7%E5%85%A8 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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