Remote Caddy reverse proxy returns 200 empty response

[kyeotic]

Describe the bug
Using Caddy (v2) as a reverse proxy I am unable to access the UI. Caddy is running on a different host than the change-detection.io docker container.

Version
Exact version in the top right area: 0.52.8

How did you install?

Docker compose

services:
    changedetection:
      image: ghcr.io/dgtlmoon/changedetection.io:0.52.8
      container_name: changedetection
      hostname: changedetection
      volumes:
        - changedetection-data:/datastore

      environment:
          - USE_X_SETTINGS=1
          - TZ=America/Los_Angeles
      networks:
        changenet:
          aliases:
            - changedetection-app
      restart: unless-stopped

volumes:
  changedetection-data:

networks:
  changenet:

Caddy

@change-detector host change-detector.local.kye.dev
	handle @change-detector {
		reverse_proxy 192.168.0.20:5000
	}

To Reproduce

Steps to reproduce the behavior:

1. Navigate to reverse proxy url
2. get white screen

OR

curl -I https://change-detector.local.kye.dev 
HTTP/2 200 
alt-svc: h3=":443"; ma=2592000
server: Caddy
date: Mon, 26 Jan 2026 19:33:45 GMT

Expected behavior
UI Should load

Additional context
Caddy is running on a different host than the change-detection docker container, reverse proxy using local network IP

[dgtlmoon]

Hello, sorry, this is not an issue directly with changedetection.io but you can find many good solutions here in the discussions https://github.com/dgtlmoon/changedetection.io/discussions?discussions_q=is%3Aopen+caddy also in the wiki section about caddy https://github.com/dgtlmoon/changedetection.io/wiki/Running-changedetection.io-behind-a-reverse-proxy#caddy-reverse-proxy

[kyeotic]

Ive gone over those and do not see a solution to this. I am already using the setup from the wiki caddy-section. This appears to be an isssue with the changedetection support for reverse proxies on remote hosts.

Using

curl -v   -H "Host: change-detector.local.kye.dev"   http://192.168.0.20:5000/

Returns the UI, and accessing the via http://192.168.0.20:5000/ works. Its only when caddy tries to reverse proxy that it fails.

I have also tried this more complete caddy config

@change-detector host change-detector.local.kye.dev
	handle @change-detector {
		reverse_proxy http://192.168.0.20:5000 {
			# Force headers exactly Flask expects
			header_up Host {host}
			header_up X-Forwarded-Host {host}
			header_up X-Forwarded-Port 443
			header_up X-Forwarded-Proto https
			header_up X-Forwarded-For {remote_host}
			# Disable HTTP/2 to avoid dropped responses
			transport http {
				versions 1.1
			}
		}
	}

[kyeotic]

@dgtlmoon Can you please re-open this? None of the links you provided have a solution; the first one actually has another unanswered caddy user