If you do something really silly - like$client->request('/foo') (where nobase_uri is configured), HttpClient correctly explodes with:

Invalid URL: scheme is missing in "/SymfonyCasts/vinyl-mixes/main/mixes.json". Did you forget to add "http(s)://"?

However, in this situation, there will be nodebug key in$trace. And so, currently on 6.1, instead of the above error, you see:

Warning: Undefined array key "debug"

Let me know if any changes are needed.

Thanks!