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
(cd assets && npm install && node node_modules/brunch/bin/brunch build)
mix ecto.setup
mix phx.server
open http://localhost:4000