Clients MAY use the If-Schedule-Tag-Match request header to do a PUT request that ensures that "inconsequential" changes on the server do not result in a precondition error. The value of the request header is set to the last Schedule-Tag value received for the resource being modified. If the value of the If-Schedule-Tag-Match header matches the current value of the CALDAV:schedule-tag property, the server MUST take any "ATTENDEE" property changes for all "Attendees" other than the owner of the scheduling object resource and apply those to the new resource being stored. Otherwise, the server MUST fail the request with a 412 Precondition Failed status code.
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3.2.10.1. PUT
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