.await.unwrap();
axum::serve(listener, app).await.unwrap();
# };
```

Running the handler directly is faster since it avoids the overhead of routing:

```rust
use axum::handler::HandlerWithoutStateExt;

async fn handler() {}

# async {
let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await.unwrap();
axum::serve(listener, handler.into_make_service()).await.unwrap();
# };
```