在使用Ruby on Rails发送响应之前，我如何等待多个异步操作完成?

In Ruby on Rails, I've realized that it's synchronous by nature, and it's up to the developer to do synchronous things asynchronously. In some web dev I do, I have multiple operations beginning, like GET requests to external APIs, and I want them to both start at the same time because one doesn't rely on the result of the other. I found the In Ruby on Rails, I've realized that it's synch