When Cache-Control set to no-store and Rules Engine set to Honor Origin, will AFD specific headers still be dropped?

Question

Hello,

Will the below headers still be dropped when Honor Origin is set and Cache-Control for the route is no-store?

https://learn.microsoft.com/en-us/azure/frontdoor/front-door-caching?pivots=front-door-standard-premium#request-headers

• Content-Length
• Transfer-Encoding
• Accept
• Accept-Charset
• Accept-Language
• Vary

Answer 1

Hello Jakhongir Mustafaev

You asked if certain headers are still dropped when using Azure Front Door (AFD) with Cache-Control set to no-store and the Rules Engine configured to honor the origin. Here’s what happens:

Setting Cache-Control: no-store tells the system not to cache the response. As a result, some request headers are not forwarded to the origin. Specifically, these headers are dropped:

1. Content-Length
2. Transfer-Encoding
3. Accept
4. Accept-Charset
5. Accept-Language
6. Vary

Even when Honor Origin is enabled, AFD follows the origin server’s cache directives. However, with no-store in place, AFD will drop these headers regardless of the cache configuration.

For additional details, you can check the referenced documentation.

Rule set actions

Caching with Azure Front Door

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