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James Moessis f410084b21 propagation: extract of multiple header values (#5973 )

* Add `ValuesGetter` interface, an optional `TextMapCarrier` feature
that adds `Values(string) []string`.
* `HeaderCarrier` implements `ValuesGetter`.
* Change `Baggage` to use the `Values()` method if it's implemented.

Notable comment:
https://github.com/open-telemetry/opentelemetry-go/pull/5973#discussion_r2074894706

Adds tests extracting requests with multiple 'baggage' headers set.
Does not introduce any breaking changes or alter any existing tests.

Spec issue:
https://github.com/open-telemetry/opentelemetry-specification/issues/433
Corresponding Java prototype:
https://github.com/open-telemetry/opentelemetry-java/pull/6852

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Co-authored-by: Robert Pająk <pellared@hotmail.com>
Co-authored-by: dmathieu <42@dmathieu.com>

2025-05-15 09:14:35 +02:00

baggage_test.go

propagation: extract of multiple header values (#5973 )

2025-05-15 09:14:35 +02:00

baggage.go

propagation: extract of multiple header values (#5973 )

2025-05-15 09:14:35 +02:00

doc.go

[chore] Simplify the license header (#4987 )

2024-02-29 07:05:28 +01:00

example_test.go

Add example for SetTextMapPropagator (#6579 )