Sample
google.golang.org/grpc v1.83.0: Preserve caller-supplied outgoing gRPC metadata when a unary client interceptor adds its own metadata
Verified sample for golang google.golang.org/grpc v1.83.0: Preserve caller-supplied outgoing gRPC metadata when a unary client interceptor adds its own…
sha256:a8acd8ef9a84180020f012467fae967f3de130dff4d432708ac5bf0a6df64717
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
go 1.26 linux x64 go 1.26 go go
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| go 1.26 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-17 |
| go 1.26 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-18 |
Case
HOW- Goal
- Preserve caller-supplied outgoing gRPC metadata when a unary client interceptor adds its own metadata
- Symbols
-
- google.golang.org/grpc.NewServer
- google.golang.org/grpc.Server.RegisterService
- google.golang.org/grpc.NewClient
- google.golang.org/grpc.WithContextDialer
- google.golang.org/grpc.WithTransportCredentials
- google.golang.org/grpc.WithUnaryInterceptor
- google.golang.org/grpc.ClientConn.Invoke
- google.golang.org/grpc/test/bufconn.Listen
- google.golang.org/grpc/metadata.NewOutgoingContext
- google.golang.org/grpc/metadata.AppendToOutgoingContext
- google.golang.org/grpc/metadata.FromIncomingContext
- google.golang.org/grpc/status.Code
- Environment
- go 1.26
- Created
- 2026-08-17T01:31:28Z
Contract
- A grpc.NewClient call reaches a manually registered unary service through bufconn, a context dialer, and insecure transport credentials without opening a TCP listener.
- When a unary client interceptor uses metadata.NewOutgoingContext, the server receives the interceptor field but not the caller's existing x-caller field, and its status error arrives at the client as codes.Unauthenticated.
- When the interceptor uses metadata.AppendToOutgoingContext instead, metadata.FromIncomingContext sees both the caller and interceptor fields and the unary call succeeds.
Files
- NOTES.md
- csx.json
- go.mod
- go.sum
- metadata_interceptor_test.go