feat: document experimental static headers

src/content/docs/en/guides/integrations-guide/netlify.mdx

@@ -327,6 +327,39 @@ export default defineConfig({
 });
 ```
 
+## Experimental features
+
+The following features are also available for use, but may be subject to breaking changes in future updates. Please follow the [`@astrojs/netlify` CHANGELOG](https://github.com/withastro/astro/tree/main/packages/integrations/netlify/CHANGELOG.md) carefully for updates if you are using these features in your project.
+
+### `experimentalStaticHeaders`
+
+<p>
+  **Type:** `boolean` <br />
+  **Default:** `false`<br />
+  <Since v="6.5.0"  pkg="@astrojs/netlify"/>
+</p>
+
+Enables specifying custom headers for prerendered pages in Netlify's configuration.
+
+If enabled, the adapter will save [static headers in the Framework API config file](https://docs.netlify.com/frameworks-api/#headers) when provided by Astro features, such as Content Security Policy.
+
+For example, when [experimental Content Security Policy](/en/reference/experimental-flags/csp/) is enabled, `experimentalStaticHeaders` can be used to add the CSP `headers` to your Netlify's configuration, instead of creating a `<meta>` element:
+
+```js title="astro.config.mjs" {6}
+import { defineConfig } from 'astro/config';
+import netlify from '@astrojs/netlify';
+
+export default defineConfig({
+  experimental: {
+    csp: true
+  },
+  adapter: netlify({
+    experimentalStaticHeaders: true 
+  })
+});
+```
+
+
 ## Examples
 
 * The [Astro Netlify Edge Starter](https://github.com/sarahetter/astro-netlify-edge-starter) provides an example and a guide in the README.

src/content/docs/en/guides/integrations-guide/node.mdx

@@ -10,6 +10,7 @@ i18nReady: true
 ---
 
 import PackageManagerTabs from '~/components/tabs/PackageManagerTabs.astro'
+import Since from '~/components/Since.astro';
 
 This adapter allows Astro to deploy your [on-demand rendered routes and features](/en/guides/on-demand-rendering/) to Node targets, including [server islands](/en/guides/server-islands/), [actions](/en/guides/actions/), and [sessions](/en/guides/sessions/).
 
@@ -106,6 +107,33 @@ export default defineConfig({
 });
 ```
 
+
+### `experimentalStaticHeaders`
+
+<p>
+  **Type:** `boolean` <br />
+  **Default:** `false`<br />
+  <Since v="9.3.0"  pkg="@astrojs/node"/>
+</p>
+
+If enabled, the adapter will serve the headers of prerendered pages using the `Response` object when provided by Astro features, such as Content Security Policy.
+
+For example, when [experimental Content Security Policy](/en/reference/experimental-flags/csp/) is enabled, `experimentalStaticHeaders` can be used to add the CSP headers to the `Response` object instead of creating a `<meta>` element:
+
+```js title="astro.config.mjs" {6}
+import { defineConfig } from 'astro/config';
+import node from '@astrojs/node';
+
+export default defineConfig({
+  experimental: {
+    csp: true
+  },
+  adapter: node({
+    experimentalStaticHeaders: true 
+  })
+});
+```
+
 ## Usage
 
 First, [performing a build](/en/guides/deploy/#building-your-site-locally). Depending on which `mode` selected (see above) follow the appropriate steps below: