Inconsistent content type variants

[Arrvi]

Some endpoints cannot receive or respond XML output, while other do. Some only accept url-encoded form data. That means client cannot work consistently with XML parser only.

Examples:

• GET /collctions/list
• POST /collections/createCollection?collName={colName} (plain text only - would expect wrapper object for consistency)
• GET /collections/{colId}/list

I don't expect it to be fixed soon as it seems like major controller cleanup, but I consider it important to keep in mind for future development.