An example of extending Jenkins Pipelines with a Groovy HTTPClient for making REST calls.
Refer to the Jenkins Pipeline docs for setup instructions, but basically, this repo's contents should be added to ${JENKINS_HOME}/workflow-libs. The gradle related files are merely for development purposes.
With the src/ and vars/ directories added to that folder, you can use the testingStuff global in your Pipeline job definitions, e.g.:
node() {
testingStuff.print_ghibli_films()
String slackUrl = 'https://hooks.slack.com/services/use/real/hookurl'
Map<?, ?> postBody = ["text": "greetings from jenkins", channel: "#random"]
testingStuff.notifySlack(slackUrl, postBody)
}
would print out a list of Studio Ghibli films in your build log, then post a message to your Slack's #random channel.