问OCR名片识别出现303,什么原因？

"code":303,"message":"youtu http response failed"

{"result_list":[{"code":303,"message":"youtu http response failed","url":"https:\/\/ren.baihuanyuntu.com\/public\/uploads\/businessCard\/20180928\/s_5f3c6843622b6bbe756097e3b9d4aa3a.jpg","data":[]}],"http_code":500}