Outgoing GW Metadata

gwmux.go

 gwmux := runtime.NewServeMux(runtime.WithForwardResponseOption(forwardResponseOption))
 
func forwardResponseOption(ctx context.Context, w http.ResponseWriter, p proto.Message) error {
 
  for k, v := range w.Header() {
    log.Printf("%s=%s\n", k, v)
  }

  md, ok := runtime.ServerMetadataFromContext(ctx)
  if !ok {
    log.Println("Unable to retrieve metadata from context")
    return fmt.Errorf("error parsing server metadata from context: %v", ok)
  }

  log.Printf("Receieved %v items in header metata data and %v items in trailer metadata\n",
     md.HeaderMD.Len(), md.TrailerMD.Len())
  
  for k, v := range md.HeaderMD {
    log.Printf("%s=%s\n", k, v)
  }

  for k, v := range md.TrailerMD {
    log.Printf("%s=%s\n", k, v)
  }
  return nil
}