@astrojs/netlify Adapter processes edge middleware when building static pages

[JacobNWolf]

Astro Info

Astro                    v5.1.1
Node                     v20.13.1
System                   macOS (arm64)
Package Manager          bun
Output                   static
Adapter                  @astrojs/netlify
Integrations             @astrojs/tailwind
                         @astrojs/react
                         astro-icon
                         @astrojs/partytown
                         @sentry/astro
                         astro-robots-txt

Describe the Bug

When Astro builds a site with the Netlify adapter on static mode, it is processing the middleware when it is building static pages. This occurs regardless of whether or not edgeMiddleware: true in the adapter configuration. When the middleware uses any of the server-side headers or request methods, it outputs the message:

Astro.request.headers was used when rendering the route src/pages/*. Astro.request.headers is not available on prerendered pages. If you need access to request headers, make sure that the page is server-rendered using export const prerender = false; or by setting output to "server" in your Astro config to make all your pages server-rendered by default.

This is expected if normal middleware is elected. However, with edge middleware, middleware will run even on the static pages. Example is attached.

What's the expected result?

Ultimately if edgeMiddleware: true in the astro.config.mjs, this message should not output at all. The headers and request info are able to be accessed in edgeMiddleware even on static pages as if they were server rendered.

Link to Minimal Reproducible Example

https://stackblitz.com/edit/withastro-astro-3u3rtsrg?file=src%2Fmiddleware.ts

Participation

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