Eco-tier applications now require Router 2.0

Change effective on 28 March 2025

All Eco-tier applications now require Router 2.0 as we continue to roll the new router out to all Common Runtime apps. All new and migrated apps that use Eco dynos use Router 2.0. If your Eco apps have the http-routing-2-dot-0 feature flag, you can no longer disable it.

We begin migrating Basic-tier applications later in April, with other Common Runtime apps to follow.

Check out the Legacy Router end-of-life FAQ for updates on tentative migration timelines and the Router 2.0 article for more details.