code: func InstallHandlersWithMiddleware(r *router.Router, base router.MiddlewareChain) {
  	classicEnv.InstallHandlersWithMiddleware(r, base)
  }
docs: // InstallHandlersWithMiddleware installs handlers for framework routes using
  // classic production services.
  //
  // These routes are needed for various services provided in Base context to
  // work:
  //  * Authentication related routes (gaeauth)
  //  * Settings pages (gaesettings)
  //  * Various housekeeping crons (tsmon, gaeconfig)
  //  * Warmup (warmup)
  //
  // They must be installed into a default module, but it is also safe to
  // install them into a non-default module. This may be handy if you want to
  // move cron handlers into a non-default module.
  //
  // 'base' is expected to be an Environment's Base() or its derivative. It must
  // NOT do any interception of requests (e.g. checking and rejecting
  // unauthenticated requests).