Feature Request: Custom http headers for authentication

[ellite]

I'd like to request the possibility to authenticate with custom header tokens.

Some apps allow me to set custom headers that the proxy can use to authenticate the requests (tautulli for example) or api endpoints from a CI/CD environment.
This feature is very useful so I can keep the service behind authentication but allow mobile apps to access it through the tunnel.

Cloudflare has this feature and works really well.
On cloudflare we can add this 2 headers to the requests and they'll be authenticated.

CF-Access-Client-Id: xxxxxxxxxxxxxxxxxxxxxxxxxx
CF-Access-Client-Secret: xxxxxxxxxxxxxxxxxxxxxxxx

Thank you.

[asychev]

+1, useful for Immich as it supports passing custom headers with every request on mobile app