code: func (c *Registry) GetValidRedirectURLs(req *http.Request) (string, error) {
  	if c.v.IsSet(varValidRedirectURLs) {
  		return c.v.GetString(varValidRedirectURLs), nil
  	}
  	if c.IsPostgresDeveloperModeEnabled() {
  		return devModeValidRedirectURLs, nil
  	}
  	return c.checkLocalhostRedirectException(req)
  }
docs: // GetValidRedirectURLs returns the RegEx of valid redirect URLs for auth requests
  // If the F8_REDIRECT_VALID env var is not set then in Dev Mode all redirects allowed - *
  // In prod mode the default regex will be returned