Is not needed, is just a different async protocol implementation. Granian supports both interfaces, is a matter of how you want to write your application. As y

Is not needed, is just a different async protocol implementation. Granian supports both interfaces, is a matter of how you want to write your application. As you can see from benchmakrs (https://github.com/emmett-framework/granian/tree/master/benchmarks#interfaces https://github.com/emmett-framework/granian/tree/master/benc...), the main advantage today of RSGI vs ASGI is the performance.