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Bedework (3.10 and 5.0) answers a PUT of a new object under a name another object holds with 500 "duplicatename", whether or not it carries If-None-Match: *; only the same UID gets the 412. With save.if-none-match "ungraceful", save(no_overwrite=True) checks the name with a GET instead. Bedework 3.10 also drops an X- parameter on SUMMARY. Both found with caldav-server-tester, the first one with a probe that now also PUTs another UID. Prompt: [pick from the task list: "calendaring: remaining conformance failures on Ox, Zimbra and others"] Followup-Prompt: ... First priority is to get the conformance tests passing for all the caldav servers available ... Assisted-By: Claude Opus 5.5 <noreply@anthropic.com> Reviewed-by: Tobias Brox <tobias@redpill-linpro.com>
GMX answers 403 to a task with STATUS:PENDING or STATUS:FAILED, the two values RFC 10051 adds, so save-load.todo.status.rfc10051 is "ungraceful" there, with both values refused. Probed with caldav-server-tester. Prompt: [pick from the task list: "calendaring: remaining conformance failures on Ox, Zimbra and others"] Followup-Prompt: ... First priority is to get the conformance tests passing for all the caldav servers available ... Assisted-By: Claude Opus 5.5 <noreply@anthropic.com> Reviewed-by: Tobias Brox <tobias@redpill-linpro.com>
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Disclaimer: AI-generated code and text below the line, generated by Claude Opus 5.5, from the prompt(s):
Compatibility hints found while getting the calendaring conformance suite to pass on every test server, all probed with caldav-server-tester on 2026-11-11:
save.if-none-matchisungraceful. A PUT of a new object under a name another object holds is refused with 500 "duplicatename", with or withoutIf-None-Match: *, sosave(no_overwrite=True)raised a 500 error rather thanConsistencyError. With the hint it checks the name with a GET before the PUT. Thesave.if-none-matchdescription now definesungraceful. The probe change that found it: https://github.com/python-caldav/caldav-server-tester/tree/fix/if-none-match-other-uidsave-load.icalendar.x-parameterisunsupported; an X- parameter on SUMMARY is dropped.save-load.todo.status.rfc10051isungraceful; a task with STATUS:PENDING or FAILED is refused with 403.The last two are features not released yet, so they extend the existing "added" changelog fragment instead of getting fragments of their own.