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="6.4.0"  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 configuration, instead of creating a `<meta>` element:
+
+```js title="astro.config.mjs" {9}
+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" {9}
+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:

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

@@ -394,12 +394,6 @@ declare namespace App {
 }
 ```
 
-### Node.js Version Support
-
-The `@astrojs/vercel` adapter supports specific Node.js versions for deploying your Astro project on Vercel. To view the supported Node.js versions on Vercel, click on the settings tab for a project and scroll down to "Node.js Version" section.
-
-Check out the [Vercel documentation](https://vercel.com/docs/functions/serverless-functions/runtimes/node-js#default-and-available-versions) to learn more.
-
 ### Sessions
 
 The Astro [Sessions API](/en/guides/sessions/) allows you to easily store user data between requests. This can be used for things like user data and preferences, shopping carts, and authentication credentials. Unlike cookie storage, there are no size limits on the data, and it can be restored on different devices. 
@@ -454,4 +448,43 @@ For example, if you have installed [a Redis integration](https://vercel.com/mark
 
 </Steps>
 
+## Node.js Version Support
+
+The `@astrojs/vercel` adapter supports specific Node.js versions for deploying your Astro project on Vercel. To view the supported Node.js versions on Vercel, click on the settings tab for a project and scroll down to "Node.js Version" section.
+
+Check out the [Vercel documentation](https://vercel.com/docs/functions/serverless-functions/runtimes/node-js#default-and-available-versions) to learn more.
+
+## Experimental features
+
+The following features are also available for use, but may be subject to breaking changes in future updates. Please follow the [`@astrojs/vercel` CHANGELOG](https://github.com/withastro/astro/tree/main/packages/integrations/vercel/CHANGELOG.md) carefully for updates if you are using these features in your project.
+
+### `experimentalStaticHeaders`
+
+<p>
+**Type:** `boolean`<br/>
+**Default:** `false`<br />
+**Available for:** Serverless <br/>
+<Since pkg="@astrojs/vercel" v="8.2.0" />
+</p>
+
+Enables specifying custom headers for prerendered pages in Vercel's configuration.
+
+If enabled, the adapter will save [static headers in the Vercel `vercel.json` file](https://vercel.com/docs/project-configuration#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 Vercel configuration, instead of creating a `<meta>` element:
+
+```js title="astro.config.mjs" {9}
+import { defineConfig } from 'astro/config';
+import vercel from '@astrojs/vercel';
+
+export default defineConfig({
+  experimental: {
+    csp: true
+  },
+  adapter: vercel({
+    experimentalStaticHeaders: true 
+  })
+});
+```
+
 [astro-integration]: /en/guides/integrations-guide/