Can't make tutor-xqueue plugin grade submission

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Hi, I tried to install GitHub - overhangio/tutor-xqueue: Xqueue plugin for Tutor using provided instructions in README and got stucked on reproducing example.

tutor xqueue submissions count and tutor xqueue submissions show work as expected, but tutor xqueue submissions grade fails with read: connection reset by peer in logs (though /xqueue/login/ was successful)

My tutor vesion is 15.1.0 and tutor-xqueue 15.0.0, both installed from pip
I rebuilt all images (several times…) and used tutor local launch

What can be possible reasons for this read: connection reset by peer?

Here are the logs from tutor local logs --tail=100 -f for local tutor run:

tutor_local-xqueue-consumer-1            | running consumers
tutor_local-caddy-1                      | {"level":"info","ts":1673521972.5126934,"logger":"http.log.access.log3","msg":"handled request","request":{"remote_addr":"172.18.0.1:37440","proto":"HTTP/1.1","method":"POST","host":"xqueue.local.overhang.io","uri":"/xqueue/login/"},"user_id":"","duration":0.078369046,"size":42,"status":200}
tutor_local-xqueue-1                     | [pid: 7|app: 0|req: 2/3] 172.18.0.7 () {40 vars in 540 bytes} [Thu Jan 12 11:12:52 2023] POST /xqueue/login/ => generated 42 bytes in 80 msecs (HTTP/1.1 200) 5 headers in 406 bytes (2 switches on core 0)
tutor_local-caddy-1                      | {"level":"error","ts":1673521972.5165203,"logger":"http.log.error.log3","msg":"read tcp 172.18.0.7:42342->172.18.0.3:8000: read: connection reset by peer","request":{"remote_addr":"172.18.0.1:37440","proto":"HTTP/1.1","method":"POST","host":"xqueue.local.overhang.io","uri":"/xqueue/put_result/","headers":{"Connection":["keep-alive"],"Cookie":["csrftoken=EWL61c9uEdIh4977LlpJR4KUkoU9EngLxvq1njkfMIaazlL3xDddVNGkIYQhjE3C; sessionid=rz1yoev1q0oopnsx6uobmypvmmm85p9t"],"Content-Length":["212"],"Content-Type":["application/x-www-form-urlencoded"],"User-Agent":["python-requests/2.28.1"],"Accept-Encoding":["gzip, deflate"],"Accept":["*/*"]}},"duration":0.001145645,"status":502,"err_id":"5ve4cx3if","err_trace":"reverseproxy.statusError (reverseproxy.go:886)"}
tutor_local-caddy-1                      | {"level":"error","ts":1673521972.516556,"logger":"http.log.access.log3","msg":"handled request","request":{"remote_addr":"172.18.0.1:37440","proto":"HTTP/1.1","method":"POST","host":"xqueue.local.overhang.io","uri":"/xqueue/put_result/"},"user_id":"","duration":0.001145645,"size":0,"status":502}

python exception:

Traceback (most recent call last):
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/reque
sts/models.py", line 971, in json
    return complexjson.loads(self.text, **kwargs)
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/simpl
ejson/__init__.py", line 525, in loads
    return _default_decoder.decode(s)
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/simpl
ejson/decoder.py", line 370, in decode
    obj, end = self.raw_decode(s)
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/simpl
ejson/decoder.py", line 400, in raw_decode
    return self.scan_once(s, idx=_w(s, idx).end())
simplejson.errors.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
Traceback (most recent call last):
  File "/home/developer/miniconda3/envs/tutor/bin/tutor", line 8, in <module>
    sys.exit(main())
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/tutor
/commands/cli.py", line 24, in main
    cli()  # pylint: disable=no-value-for-parameter
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/click
/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/click
/core.py", line 1055, in main
    rv = self.invoke(ctx)  
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/click
/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/click
/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/click/decorators.py", line 38, in new_func
    return f(get_current_context().obj, *args, **kwargs)
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/tutorxqueue/plugin.py", line 117, in grade_submission
    print_result(
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/tutorxqueue/plugin.py", line 132, in print_result
    result = func(*args, **kwargs)
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/tutorxqueue/plugin.py", line 201, in grade_submission
return self.request(   
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/tutorxqueue/plugin.py", line 218, in request
    return response.json() 
  File "/home/developer/miniconda3/envs/tutor/lib/python3.10/site-packages/requests/models.py", line 975, in json
    raise RequestsJSONDecodeError(e.msg, e.doc, e.pos)
requests.exceptions.JSONDecodeError: Expecting value: line 1 column 1 (char 0)