how to send cache-control header in front door premium cache

Vishal Shah 20

I want to set cache control header in front door premium routes.

I am not able to do it, can someone explain where can i add cache control header

Sai Prasanna Sinde 3,595 Reputation points Microsoft Vendor

2025-01-30T09:48:31.1833333+00:00

Hi @Vishal Shah

Just checking in to see if you have got a chance to see the answer posted by @Deepanshu katara .

If it was helpful, please click "Accept Answer" on this post to let us know.

If you have any further questions, please let us know in the comments below so that the question can be answered.
Sai Prasanna Sinde 3,595 Reputation points Microsoft Vendor

2025-02-03T18:46:40.7333333+00:00
Hi @Vishal Shah Just checking in to see if you have got a chance to see the answer posted by @Deepanshu katara .

If it was helpful, please click "Accept Answer" on this post to let us know.

If you have any further questions, please let us know in the comments below so that the question can be answered.

1 answer

Deepanshu katara 13,205 Reputation points MVP

2025-01-30T07:59:42.3633333+00:00
Hello Vishal , Welcome to MS Q&A

To set the cache control header in Azure Front Door Premium routes, you can use the Cache-Control response headers to specify how long an item should be stored in the cache. Here's the order of precedence for cache duration:

Cache-Control: s-maxage=<seconds>

Cache-Control: max-age=<seconds>

Expires: <http-date>

If the Cache-Control header is not present in the response from the origin, Azure Front Door will randomly determine a cache duration between one and three days by default. Additionally, certain Cache-Control values, such as private, no-cache, and no-store, indicate that the response should not be cached.

Make sure your caching configuration aligns with the type of content being served, as not all content is suitable for caching. For more detailed guidance, you can refer to the Azure Front Door caching documentation.

Please let us know if any ques

Kindly accept if it helps

Thanks

Deepanshu
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Vishal Shah 20 Reputation points

2025-01-30T10:32:44.9266667+00:00

Thanks Deepanshu,

I actually set cache-control: 100 to response header but i want to set cache TTL, is there any header that i need to use in rule set for setting cache TTL or any other setting for cache TTL in front door profile?

Deepanshu katara 13,205 Reputation points MVP

2025-01-30T11:22:21.3566667+00:00

To set the cache Time-To-Live (TTL) in Azure Front Door, you can utilize the Rules Engine configuration. Here are the options available:

Cache Behavior:

Honor origin: Azure Front Door respects the origin response header directive. If the origin does not specify a directive, it will cache content for one to three days.

Override always: Forces Azure Front Door to cache the content for the specified cache duration, ignoring any origin response directives.

Override if origin missing: Uses the specified cache duration if the origin does not return caching TTL values.

Cache Configuration:

You can set cache behavior based on query strings, such as ignoring them or treating each unique URL (including query strings) as a separate cached asset.

Dynamic Compression:

Enable dynamic compression to reduce the size of the content being cached, which can improve performance.

By configuring these settings in the Rules Engine, you can effectively manage the cache duration for your content in Azure Front Door.
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