baeldung
https://www.baeldung.com/java-completablefuture
https://www.baeldung.com/java-completablefuture-non-blocking
https://www.baeldung.com/java-exceptions-completablefuture#bd-exceptionally
https://www.baeldung.com/java-completablefuture-runasync-supplyasync#bd-exception-handling
    var someFuture = supplyAsync(someSource)
            .thenCombine(supplyAsync(otherSource), combiner)
            .exceptionally(ex -> someMethod(ex.getCause()));

2024
JPoint - Demintsev - Async HTTP Clients IO Bench using JMH 0:00 of 43:40
    https://www.youtube.com/watch?v=qcC_DGkFRSA
2022
https://tutsnode.net/asynchronous-programming-in-java-se-17/
    ! 876.2m