code: public String getJobXml(FolderJob folder, String jobName) throws IOException {
          return client.get(UrlUtils.toJobBaseUrl(folder, jobName) + "/config.xml");
      }
docs: Get the xml description of an existing job.
  
  @param jobName name of the job.
  @param folder {@link FolderJob}
  @return the new job object
  @throws IOException in case of an error.