string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E4%BA%9B%E5%B8%B8%E7%94%A8%E7%9A%84%E5%85%B3%E8%81%94%E8%AF%8D => Failed to connect to 61.171.74.35 port 38041: Connection refused"
一些常用的关联词
