Apache as proxy to use same URL with subroutes for different apps - apache

Question

I am trying to set up an Apache2 web server as a proxy to redirect requests to different apps running on the server in separate Docker containers.
All requests going to route http://my_url.com/App2 should be directed to App2 running at localhost:8002.
All other requests to http://my_url.com should be redirected to App1 running on localhost:8001.
I used the following Apache configuration file:
VirtualHost my_url.com/:80>
ServerName my_url.com
ServerAlias www.my_url.com
ProxyPreserveHost On
ProxyPass /App2/ http://localhost:8002/
ProxyPassReverse /App2/ http://localhost:8002/
ProxyPass / http://localhost:8001/
ProxyPassReverse / http://localhost:8001/
</VirtualHost>
If I try to access App2, it initially redirects to the correct Docker container. However, the Problem is now that if App2 does a redirect to for example the /login route, the subroute /App2/ gets lost and Apache tries to find /login in App1 container.
What should happen is:
App2 wants to redirect to /login and makes the browser access my_url.com/App2/login and not my_url.com/login.
Is this achievable with just Apache configurations or do I need to change the redirects in App2 Docker container?

Answer 1

The issue was the line ProxyPreserveHost On. This resulted in Apache adding the header field:
X-Forwarded-Host: 'my_url.com'
for every request.
Thats why the ProxyPassReverse:
ProxyPassReverse /App2/ http://localhost:8002/
didn't work since it is only rewriting requests from http://localhost:8002/.
Setting ProxyPreserveHost Off (which is also the default) solved the issue for me.