docs: @Initializer
      public static void initStaplerCrumbIssuer() {
          WebApp.get(Jenkins.getInstance().servletContext).setCrumbIssuer(new org.kohsuke.stapler.CrumbIssuer() {
              @Override
              public String issueCrumb(StaplerRequest request) {
                  CrumbIssuer ci = Jenkins.getInstance().getCrumbIssuer();
                  return ci!=null ? ci.getCrumb(request) : DEFAULT.issueCrumb(request);
              }
  
              @Override
              public void validateCrumb(StaplerRequest request, String submittedCrumb) {
                  CrumbIssuer ci = Jenkins.getInstance().getCrumbIssuer();
                  if (ci==null) {
                      DEFAULT.validateCrumb(request,submittedCrumb);
                  } else {
                      if (!ci.validateCrumb(request, ci.getDescriptor().getCrumbSalt(), submittedCrumb))
                          throw new SecurityException("Crumb didn't match");
                  }
              }
          });
      }