I want to run Presta behind an Nginx reverse proxy. Presta 8.2.1 is running on Nginx 1.26.3. I’ve prepared:

• Reverse proxy config: https://pastebin.com/Xcx2s93f
• Presta (backend) config: https://pastebin.com/q1V8y4zx
• In Presta’s database, in the ps_shop_url table, I set the domain and domain_ssl columns to test-proxy.example.com and test-proxy.example.com respectively. By default, / in physical_uri.
• Backoffice works perfectly. In it, under Shop Parameters → Traffic & SEO, I have:

Set up URLs:

• Friendly URL → Yes
• Redirect to the canonical URL → 302 Moved Temporarily

Set shop URL:

• Shop domain → test-proxy.example.com
• SSL domain → test-proxy.example.com
• Base URI → /

The problem I deal with:
When I go to test-proxy.example.com, I get a redirect loop from test-proxy.example.com to test-proxy.example.com with a 302 status code. If I change the "Redirect to the canonical URL" option in the backoffice to 301, then I get a redirect loop with a 301 status code.

Visiting any non-existent URL, e.g. test-proxy.example.com/test, generates the correct response /index.php?controller=404.

Visiting any existing URL, e.g. test-example.com/about-us, causes a redirect loop: /about-us/ 302 → /about-us 302 → /about-us 302 → /about-us and so on in a loop.

If I only change in the database, in the above-mentioned table, test-proxy.example.com in both columns to presta-us.example.com, then the front works, but there’s a problem with the cart. This is understandable behavior.

Of course, when I completely delete reverse proxy, presta-us.example.com works smoothly like it should. :)

I have no idea what’s going on anymore. I checked the values of the headers passed by the proxy. I also prepared a script that displayed the header values: https://pastebin.com/tmT9R2Jd

The goal:
Working Prestashop front behind nginx reverse proxy.
I also set up Wordpress behind reverse proxy, which works - frontend/backoffice - like a charm.