[Feature Request] Support for customResponseHeaders in Pangolin

[mimotej]

Summary

Currently Pangolin supports only customRequestHeaders (implemented in #1446) but it seems that customResponseHeaders were not implemented at that time.

Motivation

Configuration option of customResponseHeaders in UI and blueprints would make it easier for users to configure headers such as CSP (without need to create middleware in traefik). It is also continuation of the following discussion https://github.com/orgs/fosrl/discussions/455 where it was only partially implemented.

Proposed Solution

I think solution proposed in the https://github.com/orgs/fosrl/discussions/455 still applies.

Alternatives Considered

No response

Additional Context

No response

[shanelord01]

Yes please. Adding a CSP to the "Custom Headers" field does nothing.

[Root-Core]

I also encountered this issue (#2789) and was confused about this.
I second, that this feature is only partially implemented.

CC #1446
CC #1449
CC https://github.com/orgs/fosrl/discussions/455

[Gulianrdgd]

So no updates on this? I am not seeing it on the roadmap

[Gulianrdgd]

I checked how hard it would be and decided to just open a PR: #3171