How to call REST from jenkins workflow

Question

I wonder how to call REST API from a (groovy) Jenkins workflow script. I can execute "sh 'curl -X POST ...'" - it works, but building the request as a curl command is cumbersome and processing the response gets complicated. I'd prefer a native Groovy HTTP Client to program in groovy - which one should I start with? As the script is run in Jenkins, there is the step of copying all needed dependency jars to the groovy installation on Jenkins, so something light-weight would be appreciated.

Answer 1

Native Groovy Code without importing any packages:

// GET def get = new URL("https://httpbin.org/get").openConnection(); def getRC = get.getResponseCode(); println(getRC); if(getRC.equals(200)) {     println(get.getInputStream().getText()); }   // POST def post = new URL("https://httpbin.org/post").openConnection(); def message = '{"message":"this is a message"}' post.setRequestMethod("POST") post.setDoOutput(true) post.setRequestProperty("Content-Type", "application/json") post.getOutputStream().write(message.getBytes("UTF-8")); def postRC = post.getResponseCode(); println(postRC); if(postRC.equals(200)) {     println(post.getInputStream().getText()); } 

Answer 2

There is a built in step available that is using Jenkins HTTP Request Plugin to make http requests.

Plugin: https://wiki.jenkins-ci.org/display/JENKINS/HTTP+Request+Plugin

Step documentation: https://jenkins.io/doc/pipeline/steps/http_request/#httprequest-perform-an-http-request-and-return-a-response-object

Example from the plugin github page:

def response = httpRequest "http://httpbin.org/response-headers?param1=${param1}" println('Status: '+response.status) println('Response: '+response.content)