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+# Development Server
+
+The development server comes as part of the Astro CLI. Start the server with:
+
+```shell
+astro dev
+```
+
+In your project root. You can specify an alternative
+
+## Special routes
+
+The dev server will serve the following special routes:
+
+### /400
+
+This is a custom **400** status code page. You can add this route by adding a page component to your `src/pages` folder:
+
+```
+├── src/
+│   ├── components/
+│   └── pages/
+│       └── 400.astro
+```
+
+For any URL you visit that doesn't have a corresponding page, the `400.astro` file will be used.
+
+### /500
+
+This is a custom **500** status code page. You can add this route by adding a page component to your `src/pages` folder:
+
+```astro
+├── src/ │ ├── components/ │ └── pages/ │ └── 500.astro
+```
+
+This page is used any time an error occurs in the dev server.
+
+The 500 page will receive an `error` query parameter which you can access with:
+
+```
+---
+const error = Astro.request.url.searchParams.get('error');
+---
+
+<strong>{error}</strong>
+```
+
+A default error page is included with Astro so you will get pretty error messages even without adding a custom 500 page.