docs: @RequirePOST
      public void doEval(StaplerRequest req, StaplerResponse rsp) throws IOException, ServletException {
          checkPermission(RUN_SCRIPTS);
  
          try {
              MetaClass mc = WebApp.getCurrent().getMetaClass(getClass());
              Script script = mc.classLoader.loadTearOff(JellyClassLoaderTearOff.class).createContext().compileScript(new InputSource(req.getReader()));
              new JellyRequestDispatcher(this,script).forward(req,rsp);
          } catch (JellyException e) {
              throw new ServletException(e);
          }
      }