A proxy server used by the SkinShuffle mod - used to protect the mineskin API key from production.
Simply create an API key on the mineskin website, add the SkinShuffle/Proxy user agent.
Clone the repository, run gradlew run with the env variables specified in .env.example pre-exported using export (bash) or $Env:... = ... (windows). Done! Change the proxy domain and port in your skinshuffle config in your minecraft instance.