string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E4%BC%9A%E6%88%98%E7%95%A5%E8%83%8C%E8%AF%B5%E5%8F%A3%E8%AF%80%E5%A4%A7%E5%85%A8 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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