HTTP Error: 400 Bad request on any POST behind nginx reverse proxy

[Toshka31]

I installed change detection io via docker compose:

version: '3.2'
services:
    changedetection:
      image: ghcr.io/dgtlmoon/changedetection.io
      container_name: changedetection
      hostname: changedetection
      volumes:
        - ./changedetection-data:/datastore
      environment:
        - BASE_URL=https://my-domain.ru
        - USE_X_SETTINGS=1
        - HIDE_REFERER=true
        - PLAYWRIGHT_DRIVER_URL=ws://playwright-chrome:3000
      networks:
        - docker_bridge
      restart: unless-stopped
      depends_on:
        playwright-chrome:
          condition: service_started
    playwright-chrome:
      hostname: playwright-chrome
      image: dgtlmoon/sockpuppetbrowser:latest
      cap_add:
        - SYS_ADMIN
      restart: unless-stopped
      environment:
        - SCREEN_WIDTH=1920
        - SCREEN_HEIGHT=1024
        - SCREEN_DEPTH=16
        - MAX_CONCURRENT_CHROME_PROCESSES=10
      networks:
        - docker_bridge

networks:
  docker_bridge:
    external: true
volumes:
  changedetection-data:

And here is my nginx settings:

 server {
        listen 443 ssl;
        server_name my-domain.ru;
        ssl_certificate /etc/letsencrypt/live/my-domain.ru/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/my-domain.ru/privkey.pem;

        location /changedetection/ {
             proxy_pass http://changedetection:5000/;
            proxy_set_header Host "my-domain.ru";
            proxy_set_header X-Forwarded-Prefix /changedetection;
            proxy_set_header X-Forwarded-Proto $scheme;
        }
}

With this web UI works fine, but if i trying to change any settings i receive 400 error

[dgtlmoon]

https://github.com/dgtlmoon/changedetection.io/wiki/Running-changedetection.io-behind-a-reverse-proxy

the nginx reverse proxy works perfectly according to this recipe... so it must be something on your end

[Toshka31]

I don't think that on my side, because i see error message in changedetection container logs :
172.19.0.12 - - [16/Mar/2024 20:26:28] "POST /form/checkbox-operations HTTP/1.0" 400 371 0.003202
That means that nginx just return error caused in changedetection

[Toshka31]

I added
proxy_set_header Referer "https://my-domain.ru";
to my nginx location config and now it works

@dgtlmoon is it worse to add in recipe?

[niscolas]

Don't know much about reverse Proxies but that setting indeed made the mentioned issue go away, maybe it could be indeed added to the docs