app抓取聊天记录发送给自己的服务端。

获取到的信息
{
"secret": "OeR0uiYKEeWpDsHHauicpJEUG8OL5zJbYz5M9wFcGEpel-XL",
"thumbnail_size": {
"thumbnail_size_height": 107,
"thumbnail_size_width": 161
},
"thumbnail_file_length": 30088,
"local": "/Users/xxoo/Library/Developer/CoreSimulator/Devices/6CC734C8-4BFE-49EC-954A-E8B38F7B479B/data/Containers/Data/Application/6C70F501-D0BA-4145-9FC0-C307771343E2/Library/appdata/akixie/chat/xxoo/messages/BE1C80532F8447348FFBBDD4B8D1A88B_1436426685152.jpg",
"size": {
"width": 1008,
"height": 669
},
"thumbnail_displayname": "thumbnail_image.jpg",
"filename": "image.jpg",
"type": "img",
"file_length": 508786,
"thumbnail_local": "/Users/xxoo/Library/Developer/CoreSimulator/Devices/6CC734C8-4BFE-49EC-954A-E8B38F7B479B/data/Containers/Data/Application/6C70F501-D0BA-4145-9FC0-C307771343E2/Library/appdata/xxoo/chat/xxoo/messages/640D2F93F8E14797855366B9C2583205_1436426685171.jpg",
"url": "http://a1.easemob.com/easemob-demo/chatdemoui/chatfiles/39e474b0-260a-11e5-8fa7-83543879071a"
}

为什么使用secret 和uuid，使用文件下载接口一直报错404. 是secret不是文件上传方法的share-secret吗？