code: public static boolean allowParamsOnFormAction( ServletContext servletContext, ServletRequest request )
      {
          ArrayList/*< URLRewriter >*/ rewriters = getRewriters( request );
  
          if ( rewriters != null )
          {
              for ( Iterator i = rewriters.iterator(); i.hasNext(); )  
              {
                  URLRewriter rewriter = ( URLRewriter ) i.next();
                  if ( !rewriter.allowParamsOnFormAction( servletContext, request ) ) { return false; }
              }
          }
  
          return true;
      }
docs: Tell whether rewritten form actions should be allowed to have query parameters.  If this returns
  <code>false</code>, then a form-tag implementation should render query parameters into hidden
  fields on the form instead of allowing them to remain in the URL.