pub trait Middleware:
Send
+ Sync
+ 'static {
// Required method
fn instantiate<'life0, 'async_trait>(
&'life0 self,
req: InstantiationRequest,
) -> Pin<Box<dyn Future<Output = Result<InstanceRef>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait;
}