@astrojs/node returns 500 instead of 404 for unknown prerendered dynamic endpoints in preview

Astro Info

Astro                    v7.0.7
Node                     v24.18.0
System                   Linux (x64)
Package Manager          pnpm
Output                   static
Adapter                  @astrojs/node
Integrations             @astrojs/react
                         @astrojs/mdx
                         @astrojs/sitemap
                         pagefind

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

No response

Describe the Bug

A prerendered dynamic endpoint works correctly for parameter combinations returned by getStaticPaths(). However, requesting a URL that matches the endpoint’s route pattern but contains parameters that were not returned by getStaticPaths() results in an HTTP 500 response.

The development server is not affected. The issue is reproducible when running the built application using astro preview.

The reproduction contains:

• A prerendered dynamic page
• A prerendered dynamic API endpoint

Both routes define john as a valid name parameter in getStaticPaths() and return HTTP 200 for that value.

When requesting an undefined value:

• The prerendered page correctly returns HTTP 404.
• The prerendered API endpoint incorrectly returns HTTP 500.

This appears to affect prerendered dynamic endpoints, including both JSON and XML endpoints.

What's the expected result?

When a request matches a prerendered dynamic endpoint but uses parameters that were not returned by getStaticPaths(), the server should return HTTP 404.

This should behave consistently with prerendered dynamic pages, which already return HTTP 404 for unknown parameter combinations, rather than returning HTTP 500.

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-wysncy63

Participation

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