Test Server not displaying Cope system - 404 errors

[marshalc]

Page not found (404)

Request Method: | GET
-- | --
http://dev.nds.ox.ac.uk/cope//

Using the URLconf defined in config.urls, Django tried these URL patterns, in this order:
^i18n/
en-gb/
The current path, /, didn't match any of these.
You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.

Essentially some part of the nginix/django configuration is inserting an extra slash at the end of the proxy path, but the start of the application path. URLs in the browser look correct, but:

https://dev.nds.ox.ac.uk/cope/ --> http://dev.nds.ox.ac.uk/cope//
http://dev.nds.ox.ac.uk/cope --> redirects to https://dev.nds.ox.ac.uk/cope/en-gb/, and then gives this 404 for http://dev.nds.ox.ac.uk/cope//en-gb/
https://dev.nds.ox.ac.uk/cope/en-gb/admin --> http://dev.nds.ox.ac.uk/cope//en-gb/admin

This isn't affecting the QUOD site, which is presently on Django 1.11.4, so suspecting some sort of interaction issue between Django 2.0.7 (was working with Django 2.0.1?) and NGinx.

[marshalc]

May be related to how I solved this initially - https://stackoverflow.com/questions/44987110/django-in-subdirectory-admin-site-is-not-working/47099986#47099986

https://www.nginx.com/resources/wiki/start/topics/examples/forwarded/ doesn't show any reasons for NGinx not working as expected. And no other clues have appeared in more recent times.

Leaving server in this state as it's not a priority