[MM3-users] Hyperkitty is not archiving due to 405 error - GET instead of POST

Hi there,

I am running mailman3 on Debian 12 - latest package (GNU Mailman 3.3.8 (Tom Sawyer)). Message handling in general is working fine, but as soon as a message is released, archiving with Hyperkitty is not working, due to a 405 error:

Feb 11 16:18:48 2024 (3479662) HyperKitty failure on http://lists.domain.tld/mailman3/hyperkitty/api/mailman/archive: (405) Feb 11 16:18:48 2024 (3479662) Could not archive the message with id <170766472771.3479669.4791049109141956450@otherdomain.tld> Feb 11 16:18:48 2024 (3479662) archiving failed, re-queuing (mailing-list jahrgang.domain.tld, message <170766472771.3479669.4791049109141956450@otherdomain.tld>) Feb 11 16:18:48 2024 (3479662) Exception in the HyperKitty archiver: Feb 11 16:18:48 2024 (3479662) Traceback (most recent call last): File "/usr/lib/python3/dist-packages/mailman_hyperkitty/__init__.py", line 158, in _archive_message url = self._send_message(mlist, msg) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/mailman_hyperkitty/__init__.py", line 228, in _send_message raise ValueError(result.text) ValueError

When tracing this back, even the frontend Nginx server receives a get in his logs, hence I assume that hyperkitty is really creating a GET instead of a POST request?

217.72.204.162 - - [11/Feb/2024:16:18:48 +0100] "GET /mailman3/hyperkitty/api/mailman/archive HTTP/1.1" 405 0 "-" "python-requests/2.28.1"

Any idea how to trace this down any further?

Any help is really appreciated! Thanks, Matthias