The config value for the base property is not working as expected in SSR mode

[cauboy]

What version of astro are you using?

1.6.0

Are you using an SSR adapter? If so, which one?

Cloudflare (Same behavior observable for Netlify and node standalone)

What package manager are you using?

npm

What operating system are you using?

Mac

Describe the Bug

Here's my astro.config.mjs

import { defineConfig } from 'astro/config';
import cloudflare from '@astrojs/cloudflare';
import tailwind from '@astrojs/tailwind';

export default defineConfig({
  output: 'server',
  base: 'my-astro-app',
  adapter: cloudflare(),
  integrations: [tailwind()],
});

When setting e.g. base: "/my-astro-app" in astro.config.mjs all works as expected for output: "static"

1. ✅ All static files are put to dist/my-astro-app
2. ✅ The Website is accessible via http://localhost:port/my-astro-app/
3. ✅ In the served HTML, the style is loaded correctly via <link rel="stylesheet" href="/my-astro-app/assets/index.857d2ba4.css">
4. ✅ In the served HTML, the file paths of images are prefixed with my-astro-app

However, if I set output: "server" and pick e.g. the @astrojs/cloudflare adapter things behave differently:

1. ❌ Website is not accessible via http://localhost:port/my-astro-app/ but via http://localhost:port/
2. ✅ In the served HTML, the file paths of static assets e.g. images are prefixed with my-astro-app/
3. ❌ In the served HTML, the rel attributed of the linked stylesheet is not prefixed with my-astro-app/: Instead of <link rel="stylesheet" href="/my-astro-app/assets/index.857d2ba4.css"> it's <link rel="stylesheet" href="/assets/index.857d2ba4.css">
4. ❌ All files are put to dist/static/* instead of dist/static/my-astro-app/*

The same behavior is observable for other adapters such as @astrojs/netlify or @astrojs/node in standalone mode.

I would expect that the base property works the same independent whether output is set to static or server

---

How to reproduce:

• Go to https://stackblitz.com/edit/github-zhdamn-rdbepz
• In the terminal run npm run build
• Run npm run preview

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-zhdamn-rdbepz

Participation

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