Possibility to set custom HttpHeaders for tracing

Is there any chance we can get a way to set custom HttpHeader?
I would like to send tracking references (e.g. request ID) so that the logs from the OIDC provider can be linked to the logs from the app. That would make troubleshooting much easier.

Or is there perhaps even a possibility that I have overlooked?

Start by reviewing the Flutter wrapper and its AppAuth iOS and Android integrations to determine whether custom HttpHeaders are exposed. Define how callers would provide request IDs and how the headers would reach the OIDC provider; done means tracing headers can be supplied for correlating provider and app logs on both platforms.

Written by the indexing model from the issue text.