Back in September 2023, we announced our Public Beta for our new Common Runtime router: Router 2.0.

Now generally available, Router 2.0 will replace the legacy Common Runtime router in the coming months, and bring new networking capabilities and performance to our customers.

The beta launch of Router 2.0 also enabled us to deliver HTTP/2 to our customers. And now, because Router 2.0 has become generally available, HTTP/2 is also generally available for all common runtime customers and even Private Spaces customers too.

We’re excited to have Router 2.0 be the foundation for Heroku to deliver new cutting edge networking features and performance improvements for years to come.

This week, Heroku made Router 2.0 generally available, bringing features like HTTP/2, performance improvements and reliability enhancements out of the beta program!

Throughout the Router 2.0 beta, our engineering team has addressed several bugs, all fairly straight-forward with one exception involving Puma-based applications. A small subset of Puma applications would experience increased response times upon enabling the Router 2.0 flag, reflected in customers’ Heroku dashboards and router logs. After thorough router investigation and peeling back Puma’s server code, we realized what we had stumbled upon was not actually a Router 2.0 performance issue. The root cause was a bug in Puma!...

Heroku Router 2.0 is now generally available, marking a significant step forward in our infrastructure modernization efforts. The new router delivers enhanced performance and introduces new features to improve your applications’ functionality. There are, of course, nuances to be aware of with any new system, and with Router 2.0 set to become the default router soon, we’d like to share some tips and tricks to ensure a smooth and seamless transition.

Start with a Staging Application

We recommend exploring the new router’s features and validating your specific use cases in a controlled environment. If you haven’t already, spin up a staging version of your app that mirrors your production...