RXJava2: correct pattern to chain retrofit requests

Question

I am relatively new to RXJava in general (really only started using it with RXJava2), and most documentation I can find tends to be RXJava1; I can usually translate between

Answer 1

Does this not work for you?

retrofitService
.getSomething()
.flatMap(firstResponse -> retrofitService.getSecondResponse(firstResponse.id))
.doOnNext(secondResponse -> {/* both requests succeeded */})
/* do more stuff with the response, or just subscribe */