string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B2%B3%E5%8D%97%E6%B3%A8%E4%BC%9A%E5%8D%8F%E4%BC%9A%E7%94%B5%E8%AF%9D => Failed to connect to 61.171.74.35 port 38041: Connection refused"
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