Helioviewer.org occasionally requests tiles with mismatched filenames and datasource information

[Keith Hughitt]

The result of this is tiles for one datasource (e.g. AIA 304) with a color table from a different datasource (e.g. 171). Further, since color-map is not incorporated in the caching scheme all other users who request the same tile from cache will see the mismatched tiles as well.

It may be useful to also prevent this on the server-side, however, this could hinder support for user-selected colormaps in the future in browsers that do not support canvas.

[Keith Hughitt (keith-hughitt)]

Fixed as part of refactoring to tile request process: tile requests no longer use obs, instr, det, and meas but instead simply use an image id to retrieve all of the needed properties server-side. The legacy API will still persist for now, but since problem related to how the URLs were generated in Helioviewer.org front-end, the issue should not affect other uses of the API.