Thank you for your answer. I use App Engine Firewall, but you can only 
block and allow IP addresses with it. It doesn't have other features like 
blocking or allowing by country code, user agent, and request headers. So 
it's hard to prevent DDOS attacks with only App Engine Firewall since you 
have to know all IP addresses that attackers use. I hope Google will 
provide these features soon.

On Thursday, May 28, 2020 at 6:26:17 AM UTC+3, Mary (Google Cloud Support) 
wrote:
>
> Hello Cihat,
>
> Currently Cloud Armor does not support App Engine Standard or Flex. Both 
> App Engine Standard and App Engine Flexible offer a firewall which may help 
> mitigate DDoS attacks by specifying denial rules to specific or range of 
> IPs.
>
> [1] https://cloud.google.com/appengine/docs/flexible/go/creating-firewalls
>
>
> On Wednesday, May 27, 2020 at 3:00:25 PM UTC-4, Cihat Kısa wrote:
>>
>> Hello,
>>
>> I wonder if is it possible to use Cloud Armor with GAE Flex? Because in 
>> Cloud 
>> Armor's documentation 
>> <https://cloud.google.com/load-balancing/docs/https>, it says that you 
>> have to use an HTTPS Load Balancer 
>> <https://cloud.google.com/load-balancing/docs/https>. Since GAE Flex 
>> doesn't have a load balancer, how can we use Cloud Armor with GAE Flex? We 
>> have to use a WAF to prevent DDOS attacks. Is it possible to use Cloud 
>> Armor with GAE Flex through HTTPS Load Balancer? If so, can you explain how 
>> can I achieve this goal?
>>
>> Thank you.
>>
>

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