Getting it to work behind reverse proxy

[MenooMeow]

I'm using 2 different computers at my house. Both are behind a router. One computer has an NGINX reverse proxy that routes the various domains to the appropriate Virtual Machine. I set up the reverse proxy and the DNS so that Inventree is available at https://inventree.example.com/ I used a Let's Encrypt certificate at the NGINX reverse proxy. For everything else I do (NextCloud, php sites, Wordpress), this works perfectly. But, when I try to get Inventree working this way, the browser gives the error: "

inventree.example.com redirected you too many times   
Try deleting your cookies.
ERR_TOO_MANY_REDIRECTS

".

I did update the .env file to reference "https://inventree.example.com" under the INVENTREE_SITE_URL parameter.

Is there something else I need to do to get it working behind an externally hosted NGINX reverse proxy?

UPDATE 1:
I edited .env --> INVENTREE_SITE_URL="http://inventree.example.com" to remove the S from https. Now I can access the site through the internet by going to http://inventree.example.com and it seems to redirect to https on its own. I assume the container is somehow doing some kind of certificate magic? Is this a secure enough configuration or should I be able to get to https://inventree.example.com without it first starting at http://inventree.example.com?

Also, it might be related but I cannot log in with the admin username/password I specified in the .env file. It says:

Authentication Failure
You have been logged out from InvenTree.

UPDATE 2:

------------- SOLUTION SO FAR -----------------
I added the following string to the end of the .env file and it seems to work now:

INVENTREE_SITE_URL="http://inventree.example.com"
INVENTREE_TRUSTED_ORIGINS="https://inventree.example.com"

Maybe the documentation should include instructions on how to work in an external reverse proxy since it's not an uncommon configuration?