string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%96%E5%9B%BD%E8%91%97%E5%90%8D%E4%BD%9C%E5%AE%B6%E4%BD%9C%E5%93%81%E5%A4%A7%E5%85%A8 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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