如何在Heroku中执行并行HTTP请求？

I'm building a Ruby on Rails app that access about 6-7 APIs, grabs information from them based on user's input, compares and display results to the users (the information is not saved in the database). I will be using Heroku to deploy the app. I would like those HTTP requests to access the APIs to be done in parallel so the answer time is better instead of doing it sequential. What do you think is the best way to achieve this in Heroku?I'm building a Ruby on Rails app that access ab