string(244) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=dr%E4%B8%8Esdr%E7%9A%84%E8%A7%86%E9%A2%91%E5%9B%BE%E5%83%8F%E5%8C%BA%E5%88%AB => Failed to connect to 101.91.112.32 port 38221: Connection refused"
dr与sdr的视频图像区别
