Reduce round-trips on PUT for meetings
When uploading meetings/tasks, invitations for which will be sent by the server, calendar-factory sends PUT … Prefer: return=minimal. The server adds to the attendees a SCHEDULE-STATUS= parameter, so it never returns ETag, but a Schedule-Tag header.
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If Evolution is not going to show the Schedule-Status parameter, then use the Schedule-Tag to verify that nothing has changed.
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Otherwise send Prefer: return=representation to avoid subsequent GET