How do I separate remote data access (via http) logic from the business logic?

Downloading a file and doing X with it, isnt the same as building an aircraft maintenance and parts tracking system. Complexity, software lifecycle, team size, budget, time frame, all influence the "best approach.

You are at stage of patternization. A lot of people goes through this stage. It appears when you know about patterns, learned some of them and already want to apply it everywhere where it could be applyed.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.