The value of ARRAffinity is changing. I just want to use one instance all the time.

Hi, @CHEN XIAOJIE Thanks for the additional information! I understand that you're not working well because of the combination of Front Door and App Service. The App Service ARR passes the cookie of the App Service origin domain to the browser instead of the Front Door domain, so it will not work via the Front Door. If the backend origins are spread across multiple, you can enable Session Affinity for the Front Door. https://learn.microsoft.com/en-us/azure/frontdoor/routing-methods#affinity If you have one backend origin and you want to distribute it within it, you may be able to enable ARR Affinity in the following ways: Try binding the same custom domain as Front Door to the App Service for reference below. Doing so may treat the client as a valid cookie and enable ARR. https://learn.microsoft.com/en-us/answers/questions/417541/testing-in-production-with-custom-domains-and-azur.html

Azure App Service - ARR Affinity not work

Accepted answer

Takahito Iwasa 4,851 Reputation points MVP

2022-04-14T00:50:43.2+00:00

Hi, @CHEN XIAOJIE

Thanks for the additional information!
I understand that you're not working well because of the combination of Front Door and App Service.
The App Service ARR passes the cookie of the App Service origin domain to the browser instead of the Front Door domain, so it will not work via the Front Door.

If the backend origins are spread across multiple, you can enable Session Affinity for the Front Door.

https://learn.microsoft.com/en-us/azure/frontdoor/routing-methods#affinity

If you have one backend origin and you want to distribute it within it, you may be able to enable ARR Affinity in the following ways:
Try binding the same custom domain as Front Door to the App Service for reference below. Doing so may treat the client as a valid cookie and enable ARR.

https://learn.microsoft.com/en-us/answers/questions/417541/testing-in-production-with-custom-domains-and-azur.html
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2 people found this answer helpful.
Takahito Iwasa 4,851 Reputation points MVP

2022-04-15T05:08:19.647+00:00

@CHEN XIAOJIE

In addition to the settings above, you need to specify the front host header when forwarding from Azure Front Door to Backend's App Service.

This is because the domain that depends on the request host is set in the cookie that App Service responds to.
If this value does not match, the browser ignores the cookie.

For the new front door:

CHEN XIAOJIE 96 Reputation points

2022-04-17T05:56:27.757+00:00

@Takahito Iwasa

Thanks for your answer. But your image is missing.

Takahito Iwasa 4,851 Reputation points MVP

2022-04-17T05:59:14.457+00:00

@CHEN XIAOJIE

My Image URL is missing. sorry.
I evaluated the solution that puts the Front Door in front and turns on ARR Affinity.
Please check it as it is summarized in the following article. (I'm sorry in Japanese. Please use a translation tool.)

https://dev.classmethod.jp/articles/azure-app-serivce-azure-front-door-arr-affinitiy/
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Azure App Service - ARR Affinity not work

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