REDIS_URL is the TLS connection for Heroku Data for Redis Mini add-ons
Change effective on 30 September 2024
The REDIS_URL config var is now the secure TLS connection URL for all mini Heroku Data for Redis add-ons. We’ll begin rolling REDIS_URL config var values to the TLS connection for existing mini add-on plans.
As previously announced, REDIS_TLS_URL and REDIS_TEMPORARY_URL deprecates on December 2, 2024. By that date, all Redis connections require TLS with REDIS_URL. If you’re using REDIS_TLS_URL, switch now to REDIS_URL for TLS connections. If you’re using REDIS_URL and must keep your insecure connections, use the REDIS_TEMPORARY_URL config var to prepare your app for supporting TLS.
See this FAQ and Connecting to Heroku Data for Redis for more information on config var changes and examples for the most popular Redis clients in all of Heroku’s supported languages.