* 1. DownloadRequest client -> server when download start * Client inform server download start. * 2. DownloadRequestReply server -> client reply DownloadRequest * Server tell client file splitting plan. * 3. DownloadStatus client ->

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开源地图前端leaflet.js示例代码，配合离线地图下载器数据实现离线地图发布预览(Open source map front-end leaflet.js sample code, offline map downloader data, offline map publishing preview.)