- Apiserver add a new flag --goaway-chance which is the fraction of requests that will be closed gracefully(GOAWAY) to prevent HTTP/2 clients from getting stuck on a single apiserver. 
  After the connection closed(received GOAWAY), the client's other in-flight requests won't be affected, and the client will reconnect. 
  The flag min value is 0 (off), max is .02 (1/50 requests); .001 (1/1000) is a recommended starting point.

     * comment: Max age for CORS preflight requests.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getApiCorsMaxAge();

    /**
     * Get the value for the key 'api.cors.max.age' as {@link Integer}. <br>
     * The value is, e.g. 3600 <br>
     * comment: Max age for CORS preflight requests.