This basic project shows how to use the Ruby SDK in a Rails (2.7.x) application.
docker build -t rails-example .
export FF_API_KEY=<your server SDK key>
docker run -e FF_API_KEY=$FF_API_KEY -p 3000:3000 --rm rails-example
When you toggle a flag on https://app.harness.io it will be logged in the console output of the container. Since this is a server SDK you need to refresh the page in the browser to see the HTML update.