Are you ready to embark on an expedition into the core of Ruby web applications? Well, get ready, because it's time to delve into web development with Rack—the powerhouse that fuels popular Ruby web frameworks like Rails and Sinatra. In this captivating talk, we'll plunge deep into the inner workings of Rack, the unsung hero of web development. We'll uncover its secrets, bask in its versatility, and summon the magic of custom Rack middleware—where session management, authentication, and caching reside. For developers at all levels, this talk offers practical insights and fresh perspectives. Equip yourself with the prowess to wield Rack's middleware magic, making your development journey more efficient and enjoyable.