Look for an url of application.js from Rails server
npm install explore-application-js
It is used to find the url of application.js
which is unknown due to the digest.
explore-application-js https://anywhere-rails-app.com
https://anywhere-rails-app.com/assets/application-83299254db085bb3c9756256845a354db5375e393f4293abf1fa20b48e80af07.js
Even without digest you can get it.
explore-application-js https://anywhere-rails-app.com
https://anywhere-rails-app.com/assets/application.js
If not found, it is empty.
explore-application-js https://anywhere-not-rails-app.com