restfulClient.groovy

import groovyx.net.http.*
//if you import these classes statically, you'll be able to use the classes you import with this without qualified access
//notice how we're using just POST in some calls below, for example, instead of having to do Method.POST
import static groovyx.net.http.ContentType.*
import static groovyx.net.http.Method.*

class LoginService{

    def authenticateURL = //url
    def decryptURL      = //url
    
    //there's definitely some better way to send the password as digest or an encrypted string but that is left to the student to explore
    def authenticate(String username, String password){
        def params = //whatever params that you need go here, along with request body, represented as maps
        def httpClient = new HTTPBuilder(authenticateURL) //this is where the magic happens
        try {
            httpClient.request(POST) {
                uri.path = "/login" //path for your authentication endpoint
                //whatever params that you need go here, along with request body, for example uri.params = someMap
                
                response.success = { resp, reader ->
                    println "Authentication request for $username successful - ${resp.statusLine}"
                    //do whatever you need with the response
                 }
            }
        } catch (groovyx.net.http.HttpResponseException ex) {
            ex.printStackTrace()
            return null
        } catch (java.net.ConnectException ex) {
            ex.printStackTrace()
            return null
        }
    }
}