final HttpServletResponse httpResponse = (HttpServletResponse) response;
        httpResponse.addHeader(ACCESS_CONTROL_ALLOW_ORIGIN, origin);
        httpResponse.addHeader(ACCESS_CONTROL_ALLOW_METHODS, fessConfig.getApiCorsAllowMethods());
        httpResponse.addHeader(ACCESS_CONTROL_ALLOW_HEADERS, fessConfig.getApiCorsAllowHeaders());
        httpResponse.addHeader(ACCESS_CONTROL_MAX_AGE, fessConfig.getApiCorsMaxAge());

     * comment: Allowed HTTP methods for CORS.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getApiCorsAllowMethods();

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