MapStaticAssets breaks Browser Range Requests for large media files.

[viniciusmiguel]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

On .NET V9.0.100

When creating a Blazor app, that exposes a 8MB mp4 video file on wwwroot.
https://github.com/user-attachments/assets/4172f0e8-dee1-44a4-a7fa-58eed5bded6f

Using:

app.MapStaticAssets();

It causes browsers to get a 416 Range Not Satisfiable error.

The issue disappears when using the

app.UseStaticFiles(); 

instead.

Expected Behavior

Kestrel works properly with ranges.

Steps To Reproduce

Create a Blazor App on NET9 with default template
Add the attached file to wwwroot.

Add a video tag to the home page.

Exceptions (if any)

No response

.NET Version

9.0.100

Anything else?

No response

[javiercn]

@viniciusmiguel thanks for contacting us.

This is a dupe of #58829, we are planning to patch-it on a future release.