This application proxies Slack slash-command requests to Crossway's English Standard Version REST API.
When a Slack user types
/esv Romans 1, Slack will post a request to your web application. This application will
then make a GET request to api.esv.org to get the desired text, and return it back to Slack to be posted in a channel.
SlackESV can certainly be deployed as a self-executing jarfile to any server with which you are familiar. But it is tested primarily with Heroku, and is quite easy to get running on Heroku by following these steps.
That's it! You should be good to go!