Azure Front Door WAF request size

JorneS 201 Reputation points
2023-02-08T14:01:06.4566667+00:00

Hi there,

For the Application Gateway I have already another question about request sizes. On the page for the Application Gateway it is clearly stated that the max request size is 128KB.

Is there also such kind of limit for Azure Front Door?

According to some documentation, it seems to be also 128KB. When I try, and I have a request lager than 128KB, the request isn't blocked, so that would mean that the 128KB is not the limit. The only think I can think of is that it only checks the first 128KB of data.

Thanks.

Azure Front Door
Azure Front Door
An Azure service that provides a cloud content delivery network with threat protection.
750 questions
Azure Web Application Firewall
0 comments No comments
{count} votes

Accepted answer
  1. ChaitanyaNaykodi-MSFT 27,041 Reputation points Microsoft Employee
    2023-02-09T17:19:06.4366667+00:00

    @JorneS

    Thank you for reaching out us on the Microsoft Q&A forum.

    According to some documentation, it seems to be also 128KB. When I try, and I have a request lager than 128KB, the request isn't blocked, so that would mean that the 128KB is not the limit. The only think I can think of is that it only checks the first 128KB of data.

    Your understanding here is correct Azure Front Door WAF only inspects the first 128KB of the data and the remaining data is allowed through without inspection.

    Hope this answers your question. Please let us know if you have any additional questions. Thank you!


    ​​Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

    1 person found this answer helpful.

1 additional answer

Sort by: Most helpful
  1. David Broggy 6,101 Reputation points MVP
    2023-02-08T17:34:50.55+00:00

    Hi JorneS,

    The waf service should be controlling the negotiated request size, not the client.
    If you need a request size higher you'll need to upgrade to the WAF_V2 sku.

    Regards,

    1 person found this answer helpful.

Your answer

Answers can be marked as Accepted Answers by the question author, which helps users to know the answer solved the author's problem.