This is a light weight extension of groovy's RESTClient to support asyn call via RxJava
CodeNarc source
Very Groovy Browser Automation
Gradle plugin providing support for using HttpBuilder-NG to make HTTP requests as Gradle Tasks.
Lightweight SOAP and REST webservice clients for Groovy
The easy HTTP client for Groovy (and Java).
a Groovy-friendly HTTP client backed by OkHttp