Implement incremental CalDAV synchronization using the sync-collection REPORT (RFC 6578)
domain: datatracker.ietf.org · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Send an initial sync-collection REPORT with an empty DAV:sync-token to retrieve all current members of a calendar collection plus a starting sync-token.
Store the opaque sync-token string returned in the response exactly as given — its format has no defined structure and must not be parsed or constructed manually.
On subsequent polls, send sync-collection with the last stored DAV:sync-token to receive only members added, changed, or removed since that token.
Treat responses with a DAV:status of "404 Not Found" for a given href as a deletion signal, and any other response as an addition or update to fetch/refresh.
Confirm the target CalDAV server actually advertises sync-collection support (via a DAV:supported-report-set check) before relying on it, since support is optional and not all servers implement RFC 6578.
Known gotchas
Not every CalDAV server implements sync-collection — servers without it require falling back to CTag/ETag polling or full collection re-listing for change detection.
A server may return an error or invalidate the sync-token entirely if too much history has passed, requiring the same full-reset-and-restart handling as an expired token in other calendar APIs.
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