Multiple header entries with same key but different value

[k4i6]

YOUR FEATURE DESCRIPTION HERE
Additional headers can be set via com.varabyte.kobweb.api.http.Response::headers (mutable hashmap).
However, it is not possible to set multiple header entries with the same key but different values (e.g. multiple "Set-Cookie" headers).
Support for this UseCase should be added.

Suggestion:

• update the header datastructure to Map<String, List<String>>

[k4i6]

If this feature request gets approved, I would be happy to make a contribution on this.

[bitspittle]

I think this is a great feature request, and I need to work in this area in this release by good coincidence. I'm happy to accept this issue.

FYI I am currently finishing up feature work on the next release of Kotter, which will take at least a few more days, at which point I will come back to this one. So I might be a little quiet until then.

You are welcome to propose an approach! Currently, the type is Map<String, Any>. I think we can probably copy what ktor client is doing and introduce a new class. Small problem is backwards compatibility -- do we duplicate all methods to have different header versions? Or do we commit to breaking everyone in the wild who currently sets headers by passing in a Map?

P.S. The backend is using type Map<String, List<String>> so I eventually figured it out there. We just need to update the client now.