Jenkins groovy script to stop a running job

JenkinsStopJob.groovy

// Post to stop a running Jenkins job

build = 63
jobName = // Set job name here
jlc=JenkinsLocationConfiguration.get()  // Get Jenkins base URL from configuration
jenkinsBase = jlc.getUrl()
addr = "${jenkinsBase}job/${jobName}/${build}/stop" // Stop URL
authString = "frefol:d0882d0d535f52cc87f3ac3694d7ad61".getBytes().encodeBase64().toString() // Use authentication token
println("${addr}")
try {
  def connection = addr.toURL().openConnection()
  connection.setRequestProperty( "Authorization", "Basic ${authString}" )
  connection.setRequestMethod("POST") // Use post to load URL
  if( connection.responseCode == 200 ) {
    println("Build stopped")
  } else {
    println "Something bad happened. "
    println "${connection.responseCode}: ${connection.responseMessage}"
  }
}
catch (Exception ex) {
  println (ex.getMessage()) 
}