Alanxtl opened a new pull request, #3446:
URL: https://github.com/apache/dubbo-go/pull/3446
## What changed
- Store the unary handler connection in the handler context before invoking
user logic.
- Add a regression test that calls `triple.SetHeader` and
`triple.SetTrailer` from a unary handler and verifies the client receives both
values.
## Why
`SetHeader` and `SetTrailer` require `handlerOutgoingKey{}` in the handler
context to access the current `StreamingHandlerConn`. The unary handler path
only injected incoming metadata, so generated unary service implementations
could not use the documented response metadata APIs.
Closes #3444.
## Validation
```bash
go test ./protocol/triple/triple_protocol -run
TestSetHeaderAndSetTrailerInUnaryHandler -count=1
go test ./protocol/triple/triple_protocol
go test ./protocol/triple
```
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