I have downloaded jss proxy and configured my site to run in headless mode. How to configure multiple sites with different domains
Are you planning multiple jss app for multiple sites or single jss app for multiple sites?
First scenario, take different builds and keep it in different folders in the proxy server. Then define same number of config (config.js).
Install vhost (npm install vhost) in the proxy server , which can be used to conditionally take config to be executed based on the hostname.