[kdunglas]

I maintain the Mercure protocol (built on SSE) and the reference implementation (written in Go, available as a standalone binary and a Caddy module) which does exactly that: https://mercure.rocks

In addition to the free and open source server, we also provide a cloud offering and on-premises versions that support clustering using Redis Streams, Kafka, Pulsar or Postgres LISTEN/NOTIFY as backends.

The solution is used by many big actors in production for years:

How Raven Controls uses Mercure to power big events such as Cop 21 and Euro 2020: https://api-platform.com/con/2022/conferences/real-time-and-...

Pushing 8 million Mercure notifications per day to run mail.tm: https://les-tilleuls.coop/en/blog/mail-tm-mercure-rocks-and-...

100,000 simultaneous Mercure users to power iGraal: https://speakerdeck.com/dunglas/mercure-real-time-for-php-ma...