What i did / Steps to reproduce

I tried to set up a reverse proxy nginx server

Expected result

Normal operation of reverse proxy nginx server

Actual result

The page just has a white screen, nothing more. You can see the name "BlueMap" in the page header

Context

BlueMap Version:
Version: 3.20
Commit: a0b47f1
Implementation: bukkit (using paper)
Minecraft compatibility: 1.20.1 (1.20.0)

OS: Ubuntu 22.04.3 LTS (GNU/Linux 5.15.0-92-generic x86_64)
Platform: git-Paper-196 (MC: 1.20.1) (Implementing API version 1.20.1-R0.1-SNAPSHOT) (Git: 773dd72)
No mods

Configuration of reverse proxy nginx server(I hid the server's IP address)

Result of reverse proxy (white screen)

This is an issue in your reverse-proxy setup somewhere, not a BlueMap bug.
GitHub is not a good place for support, if you need support please use our support discord.