SignalR makes it easy to add real-time functionality to .NET web applications—things like live chat, instant notifications, or interactive dashboards. But what happens when your app starts to grow? A single server can only take you so far. At some point, you’ll need to take advantage of SignalR scaling features to scale out your app. In this post, we’ll walk through what it takes to scale a SignalR app to run across multiple servers. We’ll start with the basics, then show you how to use Redis as a SignalR backplane and enable sticky sessions to keep WebSocket connections stable. And we’ll deploy it all to Heroku. If you’re curious about what it takes to run a real-time app across multiple dynos, this guide is for you. What is SignalR? SignalR is a .NET library for real-time communication between servers and clients. It abstracts complex connection management and simplifies the scale-out of real-time apps.…