As in title, does Azure Front Door Premium support Vary header ? We are using Next.js application, that returns "Vary" header in response headers, but we are not sure if this is supported feature for Front Door to use this header in order to create cache keys.

Piotr Gębalski , Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well. See : From the Front Door to the client Any headers sent to Azure Front Door from the backend are also passed through to the client Kindly let us know if this helps or you need further assistance on this issue. Thanks, Kapil Please don’t forget to close the thread by clicking " Accept the answer " wherever the information provided helps you, as this can be beneficial to other community members.

Does Azure Front Door Premium support "Vary" header ?

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KapilAnanth-MSFT 46,776 Reputation points Microsoft Employee

2024-07-12T10:30:52+00:00

Piotr Gębalski,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

See : From the Front Door to the client

Any headers sent to Azure Front Door from the backend are also passed through to the client

Kindly let us know if this helps or you need further assistance on this issue.

Thanks,

Kapil

Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.
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Piotr Gębalski 20 Reputation points

2024-07-12T10:55:18.7466667+00:00

I get the Vary response header in response from Front Door, but I have another issue related to it specified in this thread: https://stackoverflow.com/questions/78739840/azure-front-door-premium-and-vary-response-header

It says, that if I do requests with different values of header specified in Vary header, then response should not come from cache, but create new cache entry based on value from header specified in Vary header. In case of Front Door it doesn't happen, there is always TCP_HITwhich ignores headers specified in Vary header.

KapilAnanth-MSFT 46,776 Reputation points Microsoft Employee

2024-07-12T11:46:57.1033333+00:00

Piotr Gębalski,

So I take it that you would like to know if a cache enabled AFD would "honor" the Vary header in the request or not.I shall check this and get back to you shortly.

KapilAnanth-MSFT 46,776 Reputation points Microsoft Employee

2024-07-15T12:45:41.5266667+00:00

Piotr Gębalski,

Currently, AFD does not honor the "Vary" header.

I shall work internally to get this documented.

You can upvote for this feature support here and add your comment, so that our Product Team can get more traction on the number of customers interested in this.

Please let us know if we can be of any further assistance here.

Thanks,

Kapil

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Does Azure Front Door Premium support "Vary" header ?

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