MapStaticAssets doesn't add correct Cache-Control headers

_This issue has been moved from [a ticket on Developer Community](https://developercommunity.visualstudio.com/t/MapStaticAssets-doesnt-add-correct-Cach/11020939)._

---
Hi,

The documentation says this about MapStaticAssets, “Fingerprinted assets are cached using the immutable directive, which results in the browser never requesting the asset again until it changes. For browsers that don’t support the immutable directive, a max-age directive is added”
[https://learn.microsoft.com/en-us/aspnet/core/fundamentals/static-files?view=aspnetcore-10.0](https://learn.microsoft.com/en-us/aspnet/core/fundamentals/static-files?view=aspnetcore-10.0)

But the published app doesn’t add these headers, so the browser validates with the server on every new request—effectively treating it as no-cache—instead of loading it from disk or memory. The results from latest Asp.Net MVC template. Am I missing something here ?


Initial response:

```

HTTP/1.1 200 OK
Cache-Control: no-cache
Content-Length: 231
Content-Type: text/css
Content-Encoding: br
Last-Modified: Tue, 23 Dec 2025 10:57:40 GMT
Accept-Ranges: bytes
ETag: "FVzJe6Q2UlG8wiE0wKPzsNcJ5m9zWTbKIN9rO8SkzT8="
Vary: Accept-Encoding
Server: Microsoft-IIS/10.0
X-Powered-By: ASP.NET
Date: Tue, 23 Dec 2025 11:31:13 GMT

```

Subsquent response:

```
HTTP/1.1 304 Not Modified
Cache-Control: no-cache
Content-Type: text/css
Content-Encoding: br
Last-Modified: Tue, 23 Dec 2025 10:57:40 GMT
Accept-Ranges: bytes
ETag: "FVzJe6Q2UlG8wiE0wKPzsNcJ5m9zWTbKIN9rO8SkzT8="
Vary: Accept-Encoding
Server: Microsoft-IIS/10.0
X-Powered-By: ASP.NET
Date: Tue, 23 Dec 2025 11:34:36 GMT

```

---
### Original Comments

#### Feedback Bot on 12/25/2025, 10:05 PM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

Start by comparing the documentation for MapStaticAssets with the response headers from the latest ASP.NET MVC template and the published app. Trace the MapStaticAssets behavior responsible for static asset caching, then verify that fingerprinted assets receive the documented Cache-Control directives rather than no-cache. A complete fix should also demonstrate the corrected headers in a regression test.

Written by the indexing model from the issue text.