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Change get_tile_finish() to provide the modification time of a tile. This allows the network tile source to use it in requests for caching, and makes expiration checking more robust since it doesn't rely on the presence of an ETag.
f2eaeee9
Change get_tile_finish() to provide the modification time of a tile. This allows the network tile source to use it in requests for caching, and makes expiration checking more robust since it doesn't rely on the presence of an ETag.