RequestBox allows you to register endpoints that will record and capture HTTP requests similar to RequestBin. It's useful for debugging webhooks and other API clients.
You can see it dogfood its own webhooks from Github here.
git clone https://github.com/kevinastone/requestbox.git
cd requestbox
mix deps.get
npm install
mix ecto.create && mix ecto.migrate
mix phoenix.server
open http://localhost:4000