Sample
HeaderCarrier combined with TraceContext extracts the first traceparent header instead of rejecting multiple traceparents per W3C specification.
sha256:e10aef8833bfae44ce90347d18a34a9caf8140393a51b1a31dd6d4e1803b1742
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- go
- Operating system
- linux
- Architecture
- x64
- Runtime
- go
- Language
- go
- Package manager
- go modules
Verification-run environments
- Execution context
- go 1.26
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- go 1.26
- Language
- go
- Package manager
- go modules
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17
Case
- Goal
- HeaderCarrier combined with TraceContext extracts the first traceparent header instead of rejecting multiple traceparents per W3C specification. HOW
- Packages
-
go.opentelemetry.io/otel v1.28.0
- Environment
- go
- Created
- 2026-08-17T06:57:23Z
Commonly assumed
Extracting from a request with multiple traceparent headers ignores them completely as mandated by the W3C Trace Context specification.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- Extracting from a HeaderCarrier with two traceparent headers yields the SpanContext of the first header rather than an invalid, empty context.
- assert that the extracted SpanContext is valid.
- assert that the extracted TraceID matches the first header's trace ID.
Files
- NOTES.md
- csx.json
- go.mod
- go.sum
- main_test.go
- test_slice.go
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- go 1.26 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17 · ed25519:d91480838ac982c9