Include the decoded body

server/rpc_router.go

@@ -188,6 +188,7 @@ func (s *service) call(ctx context.Context, router *router, sending *sync.Mutex,
 		method:      req.msg.Method,
 		endpoint:    req.msg.Endpoint,
 		body:        req.msg.Body,
+		rawBody:     argv.Interface(),
 	}
 
 	if !mtype.stream {