I would like to know how to go about using the AsyncResponse for HttpClient. I could not find any real documentation but apparently it is Symfony's middleware implementation?
Also how would this work with dependency injection? I guess it can be stacked to allow multiple middleware AsyncResponse in between?

Also: How would one go about to add e.g. an authentication middleware that has to execute a request prior to the main request like e.g. OAuth2 ? And upon unauthorized retrieves a new token too? I think it should be possible using this but to be honest I am not completely sure how to be use it.
In that regard: Do you plan to add an OAuth2 client using this too?

And I know this is quite a new feature but it looks interesting and I would like to know how to use it.