Method SetHeader

internal/transport/server_stream.go:154–165

SetHeader sets the header metadata. This can be called multiple times. This should not be called in parallel to other data writes.

(md metadata.MD)

// SetHeader sets the header metadata. This can be called multiple times.
// This should not be called in parallel to other data writes.
func (s *ServerStream) SetHeader(md metadata.MD) error {
	if md.Len() == 0 {
		return nil
	}
	if s.isHeaderSent() || s.getState() == streamDone {
		return ErrIllegalHeaderWrite
	}
	s.hdrMu.Lock()
	s.header = metadata.Join(s.header, md)
	s.hdrMu.Unlock()
	return nil
}

// SetTrailer sets the trailer metadata which will be sent with the RPC status
// by the server. This can be called multiple times.