In my original test, the POST to the /pub would crash the request in
nginx - not crash the whole process but it would error out, and the curl
would get disconnected with no data received.

Just now, before testing your PPA packages, using latest focal packages,
the POST to /pub succeeded, but then a GET  request to /sub crashed
nginx:

nginx: worker process: 
/build/nginx-KTLRnK/nginx-1.18.0/debian/modules/nchan/src/store/memory/ipc-handlers.c:417:
 memstore_ipc_send_get_message: Assertion `data.shm_chid->len>1' failed.
2021/11/11 12:12:15 [alert] 915#915: worker process 916 exited on signal 6 
(core dumped)


In general, a POST to /pub and a GET on /sub should succeed and return the same 
message.


I have a full demo with Docker and simple html app here (based on bullseye, 
since that worked at the time):
https://github.com/gdamjan/pub-sub-demo

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https://bugs.launchpad.net/bugs/1874831

Title:
  libnginx-mod-nchan distributes old/incompatible module

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