220.127.116.11. DELETE, COPY, or MOVE
Clients MAY use the If-Schedule-Tag-Match request header to do a DELETE, COPY, or MOVE 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 deleted. If the value of the If-Schedule-Tag-Match header matches the current value of the CALDAV: schedule-tag property, the server performs the normal DELETE, COPY, or MOVE request processing for the resource. Otherwise, the server MUST fail the request with a 412 Precondition Failed status code.
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