@Qqwy with all due respect, I do not think you should be implementing your own pool of workers. I would certainly avoid doing so and try to fall back to something like poolboy. And I do not think you have to do even that if you use HTTPoison: Load balancing and workers · Issue #73 · edgurgel/httpoison · GitHub
and
Allow setting hackney pool size · Issue #85 · edgurgel/httpoison · GitHub
