Heimdall: Reverse Proxy with Apache2 several wrong Endpoints

Solved in https://github.com/linuxserver/Heimdall/issues/768#issuecomment-1830048871

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Hello dear community,

I would like to use Heimdall with Apache2 Reverse Proxy as sub path and do create following configuration in it:

#Heimdall
Redirect 301 "/heimdallExternal" "/heimdallExternal/"
	<Location /heimdallExternal/>
		ProxyPreserveHost On
		ProxyPass http://localhost:9012/ retry=0 timeout=5
		ProxyPassReverse http://localhost:9012/
		RequestHeader set Connection ""
		RequestHeader set x-forwarded-proto "https"
	</Location>

My docker compose file:

version: "3.6"

services:
  heimdallExternal:
    image: lscr.io/linuxserver/heimdall
    container_name: heimdallExternal
    environment:
      - PUID=${PUID}
      - PGID=${PGID}
      - TZ=${TZ}
    volumes:
      - ${WORKINGDIR}/docker/heimdallExternal/:/config
    ports:
      - 9012:80
    restart: unless-stopped

I did update ..www/.env so that my hostname with sub path are configured:

APP_NAME=Heimdall
APP_ENV=local
APP_KEY=base64:xxxx
APP_DEBUG=false
APP_URL=https://DOMAIN/heimdallExternal

...

After that I’m able to use Heimdall under https://DOMAIN/heimdallExternal/. Unfortunately it has few issues:

1. Wrong Redirect after login

1. Crete user and protect it with password
2. Visit https://DOMAIN/heimdallExternal/ and see Login page
3. Enter password and Hit enter --> See an error page or wrong Page not Heimdall any more.
   • Open Network inspector and see correct POST request.
   • After it comes GET with wrong answer in header location: https://DOMAIN instead of location: https://DOMAIN/heimdallExternal/
4. Workaround - visit again https://DOMAIN/heimdallExternal/.

2. SOLVED - Wrong Link by editing Order

1. Visit https://DOMAIN/heimdallExternal/ and change order of TABs
2. Save and see that after page reloading nothing saved and defaults (initial) state been shown
3. Root Cause:
   • Order Endpoint ignores Settings, instead doing POST on https://DOMAIN/heimdallExternal/order it does on endpoint without / between sub path and order endpoint: https://DOMAIN/heimdallExternalorder.
   • Even more it ignores APP_URL configuration from .env and expect POST on http://localhost:9012/order instead of http://localhost:9012/heimdallExternal/order
4. Workaround - add rewrite rule to the Apache2 Server:

# You have to merge "order" and your sub path to "subPathorder"
	<Location /heimdallExternalorder>
		ProxyPreserveHost On
		ProxyPass http://localhost:9012/order retry=0 timeout=5
		ProxyPassReverse http://localhost:9012/order
		RequestHeader set Connection ""
		RequestHeader set x-forwarded-proto "https"
	</Location>

3. SOLVED - Background Image wrong URL

1. Visit https://DOMAIN/heimdallExternal/ and change your background Image
2. Standard image will be shown
3. Root Cause:
   • Image Endpoint ignores Settings, instead of doing GET on https://DOMAIN/heimdallExternal/storage/... it does on endpoint endpoint: https://DOMAIN/storage/....
4. Workaround - add rewrite rule to the Apache2 Server:

	<Location /storage/>
		ProxyPreserveHost On
		ProxyPass http://localhost:9012/storage/ retry=0 timeout=5
		ProxyPassReverse http://localhost:9012/storage/
		RequestHeader set Connection ""
		RequestHeader set x-forwarded-proto "https"
	</Location>

4. SOLVED - Wrong link by editing Pins

1. Visit https://DOMAIN/heimdallExternal/ and change your pins on the left panel
2. Nothing will happens
3. Root Cause:
   • Endpoint ignores Settings, instead of doing GET on https://DOMAIN/heimdallExternal/items/... it does on endpoint endpoint: https://DOMAIN/heimdallExternalitems/....
4. Workaround - add rewrite rule to the Apache2 Server:

	<Location /heimdallExternalitems/>
		ProxyPreserveHost On
		ProxyPass http://localhost:9012/items/ retry=0 timeout=5
		ProxyPassReverse http://localhost:9012/items/
		RequestHeader set Connection ""
		RequestHeader set x-forwarded-proto "https"
	</Location>