Cannot run TE Docker Container behind https

[justb4]

Describe the bug
Trying to run the latest Docker image ogccite/ets-ogcapi-features10 on a subpath behind an HTTPS proxy (Traefik) that handles routing and domain SSL Cert. The webapp can be accessed using the https:// URL and subpath, login is ok, start Session is ok, but when trying to run 'Start button) the test-suite, modern (Brave, Safari or other) browsers refuse to submit the internal HTML Form, complaining that the Form's POST attempts to access an http:// protocol.
Problem is "mixed-content", looks like some base-url setting within the JSP.

To Reproduce
Steps to reproduce the behavior:

1. Existing setup with Traefik frontend, several backend services like pygeoapi
2. Via docker(-compose) Traefik labeling routing (Ok)
3. Open https:///teamengine/ in browser is ok, routing works
4. TE Login and start Session is ok
5. 'Start Tests' with button 'Start' gives browser Console error, also warning when page loads: http access in form submit
6. (Also the TE cannot be configured to use any other subpath than '/teamengine').

It works (with Traefik) when using e.g. the full IP address with http and routing to port 8080 or standalone.

Expected behavior
Expecting content and form submits to follow main page protocol http or https ,like when using // form i.s.o. of explicit http:// or https://.

Screenshots

So this happens on this screen when pushing the "Start" button here.

Additional context
Not clear what the cause is, maybe some base URL setting.

[dstenger]

Thank you for reporting.

The reported issue seems to be related to opengeospatial/teamengine#501 and opengeospatial/teamengine#418.

Can you please try to enable HSTS in proxy configuration as documented at the bottom of https://opengeospatial.github.io/teamengine/installation.html?