Added
Improve `ProxyHeadersMiddleware` (2468) and (2231):
- Fix the host for requests from clients running on the proxy server itself.
- Fallback to host that was already set for empty x-forwarded-for headers.
- Also allow to specify IP Networks as trusted hosts. This greatly simplifies deployments
on docker swarm/kubernetes, where the reverse proxy might have a dynamic IP.
- This includes support for IPv6 Address/Networks.