Status update 2026-11

I’ve implemented support for DAV:sync-collection (from RFC 6578) in pimsync. With this extension, requesting for a list of items (events, todos, contacts, etc), returns a unique token. The next time that the list of items is requested, the client (e.g.: pimsync) includes this token, and the server only returns new items or those which have been changed, substantially reducing the amount of data transferred, and slightly simplifying the total work done locally. A large portion of this feature was implemented with when implementing JMAP support, since JMAP also supports this unconditionally. The work done recently focused mostly on the WebDAV-specific portions which were still missing, and on actual testing with real servers. I’m quite pleased with the result, and was positively surprised at how smooth this went — I expected this task to hit a lot more blockers and issues. I’m also glad that the generic “incremental sync” work done for JMAP fit right in for this. I did design it with…

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