runserver_plus never send a response

[nicokant]

I've got a strange behaviour with the runserver_plus command:
sometimes django doesn't send back a response, despite my view function has actually generated a valid HttpResponse. Note that this error doesn't happen when using the standard runserver command.

In order to reproduce you can refer to the repository https://github.com/NINAnor/nina-catalogue and to it's setup instructions.
When everything is installed and the server is up and running, using curl or postman you can send a POST request to http://localhost:8000/csw/ with the following payload:

<?xml version="1.0" encoding="UTF-8"?>
<csw:GetRecords xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" service="CSW" version="2.0.2" resultType="results" maxRecords="10" xmlns:gmd="http://www.isotc211.org/2005/gmd">
    <csw:Query typeNames="csw:Record">
			<csw:ElementSetName>full</csw:ElementSetName>
    </csw:Query>
</csw:GetRecords>

This will not return an answer, but from the logs you can actually see that the response has been generated.

You can change runserver_pluswith runserver inside the docker-compose.yml file and try again, in this case everything works fine.