Error moving an event between calendars

[clochix]

See this thread.

Sync return a 412 error, here are the logs:

Exception:  { [Error: An If-None-Match header was specified, but the ETag matched (or * was specified).]
  code: 412,
  type: 'PreconditionFailed',
  message: 'An If-None-Match header was specified, but the ETag matched (or * was specified).',
  header: 'If-None-Match' }