Custom 404 page returns invalid 404 OK status in server mode

[dralshehri]

Astro Info

Astro                    v5.3.0
Node                     v22.14.0
System                   macOS (arm64)
Package Manager          unknown
Output                   server
Adapter                  @astrojs/cloudflare
Integrations             @astrojs/react

If this issue only occurs in one browser, which browser is a problem?

No response

Describe the Bug

When using server-side rendering (SSR) with a custom src/pages/404.astro page, the server responds with a 404 OK status code.

This issue occurs in both development and production environments.

The issue can be resolved by explicitly setting the response status in the 404 page:

Astro.response.status = 404
Astro.response.statusText = 'Not Found'

Note: The default 404 page provided by Astro behaves correctly.

What's the expected result?

The server should respond with a 404 Not Found status code when serving the custom 404 page.

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-28wvkirt?file=src%2Fpages%2F404.astro

Participation

• I am willing to submit a pull request for this issue.