code: func (c *Config) AppURL() map[string]string {
  	appURL := make(map[string]string, len(c.apps))
  	for _, ap := range c.apps {
  		appURL[ap.ProgramName()] = ap.BackendURL()
  	}
  	return appURL
  }
docs: // AppURL returns a map of app name to app base URL for all the configured
  // server apps.