grape

https://github.com/intridea/grape

Ruby

An opinionated framework for creating REST-like APIs in Ruby.

ApplicationController#u2f_app_id

U2F (universal 2nd factor) devices need a unique identifier for the application
to perform authentication.
https://developers.yubico.com/U2F/App_ID.html

Source | Google | Stack overflow

Edit

git clone [email protected]:intridea/grape.git
cd grape
open

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-ApplicationController-u2f_app_id-for-pr

# Commit to git

git add git commit -m "better docs for ApplicationController#u2f_app_id"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-ApplicationController-u2f_app_id-for-pr

hub pull-request

# Celebrate!