code: @RequestMapping(value = ENDPOINT_RESPONSE, method = {RequestMethod.GET, RequestMethod.POST})
      public View redirectResponseToFlow(@PathVariable("clientName") final String clientName,
                                         final HttpServletRequest request, final HttpServletResponse response) {
          return buildRedirectViewBackToFlow(clientName, request);
      }
docs: Redirect response to flow. Receives the CAS, OAuth, OIDC, etc. callback response, adjust it to work with
  the login webflow, and redirects the requests to the login webflow endpoint.
  
  @param clientName the path-based parameter that provider the pac4j client name
  @param request    the request
  @param response   the response
  @return the view