Niddler is a network debugging utility for Android apps that caches network requests/responses, and exposes them over a websocket. It comes with a simple interceptor for Square's OkHttpClient, as well as a No-op interceptor for use in release scenario's.
Niddler-UI is the UI component that communicates with Niddler over a websocket. It comes as a standalone Swing application, as well as an Android Studio / IntelliJ plugin.
To install Niddler-UI into Android Studio / IntelliJ, grab the latest release on our releases page and load the plugin by going to Preferences > Plugins > Install plugin from disk