Question/request about the listener IP address for...

# http4k

[Dan T]

Question/request about the listener IP address for Undertow:
I see this PR was rejected: https://github.com/http4k/http4k/pull/649

I have a similar use case that seems pretty common and critical from a security perspective:
We use a security sidecar pattern on the host that forwards requests to our HTT4K server including authorization headers.

I can't have the server listen on 0.0.0.0, and I don't see a way to modify the configuration using the ServerConfig object. So the only option I'm aware of currently is to create my own class similar to Undertow. Before I do that, I thought I'd double-check in case I'm missing something or this use case changes the perspective. Thanks.

[Dan T]

I'm happy to issue another PR to allow an override to the listen IP if that matters.

[dave]

Thanks - but we won't accept it 🙂 - the rationale hasn't changed.

As per the below link:

Each of the server backends implement an interface ServerConfig, which is written with sensible defaults for the server in questions, but is also designed to be used as a starting point for tweaking to API user needs. To customize, simply use the relevant ServerConfig class as a starting point and reimplement as required. See the how-to guides for an example of this in use.

https://www.http4k.org/guide/reference/servers/#customisation

[dave]

Basically we don't want to try and build some type of DSL over the server API - it would just be much more work for us to have to maintain so we sidestep the problem entirely.

[Dan T]

👍 thanks David