Dart Frog is a server-side framework, similar to NodeJS and friends.
Consider adding a header util instead of parsing headers manually, issue.
Check if the single hub/scope won't attach spans to the wrong transaction, this could be possible due to the nature of the Dart SDK being user SDKs as of now (Mobile, Web).
Description
https://pub.dev/packages/dart_frog
Dart Frog is a server-side framework, similar to NodeJS and friends.