Get Started with Sidekiq and Upstash Redis on Fly.io

The text provides a comprehensive guide on setting up a sample application using the Sidekiq background processing library on Fly.io, utilizing Upstash Redis for efficient task management. It explains how Sidekiq allows processes to be distributed to workers, ensuring the main server remains responsive by offloading heavy or recurring tasks. The setup involves creating a Fly.io account, configuring Upstash Redis, and writing application code using Ruby, Sinatra, and Sidekiq to handle queued tasks like sending email notifications based on user input. The document outlines steps for deploying the application using Fly.io's CLI tools, detailing how to enqueue and update tasks through various endpoints, and concludes by emphasizing the benefits of improved server responsiveness and user experience.