> ## Documentation Index
> Fetch the complete documentation index at: https://wiki.another-horizon.eu/llms.txt
> Use this file to discover all available pages before exploring further.

# Content Security Policy (CSP) configuration

> Configure CSP headers to allow Mintlify resources while maintaining security for reverse proxies, firewalls, and networks that enforce strict security policies.

Content Security Policy (CSP) is a security standard that helps prevent cross-site scripting (XSS) attacks by controlling which resources a web page can load. Mintlify serves a default CSP that protects most sites. If you host your documentation behind a reverse proxy or firewall, that overwrites the default CSP, you may need to configure CSP headers for features to function properly.

## CSP directives

The following CSP directives are used to control which resources can be loaded:

* `script-src`: Controls which scripts can be executed
* `style-src`: Controls which stylesheets can be loaded
* `font-src`: Controls which fonts can be loaded
* `img-src`: Controls which images, icons, and logos can be loaded
* `connect-src`: Controls which URLs can be connected to for API calls and WebSocket connections
* `frame-src`: Controls which URLs can be embedded in frames or iframes
* `default-src`: Fallback for other directives when not explicitly set

## Domain whitelist

| Domain                          | Purpose                         | CSP directive               | Required |
| :------------------------------ | :------------------------------ | :-------------------------- | :------- |
| `d4tuoctqmanu0.cloudfront.net`  | KaTeX CSS, fonts                | `style-src`, `font-src`     | Required |
| `*.mintlify.dev`                | Documentation content           | `connect-src`, `frame-src`  | Required |
| `*.mintlify.com`                | Dashboard, API, analytics proxy | `connect-src`               | Required |
| `leaves.mintlify.com`           | Assistant API                   | `connect-src`               | Required |
| `d3gk2c5xim1je2.cloudfront.net` | Icons, images, logos            | `img-src`                   | Required |
| `d1ctpt7j8wusba.cloudfront.net` | Mint version and release files  | `connect-src`               | Required |
| `mintcdn.com`                   | Images, favicons                | `img-src`, `connect-src`    | Required |
| `*.mintcdn.com`                 | Images, favicons                | `img-src`, `connect-src`    | Required |
| `api.mintlifytrieve.com`        | Search API                      | `connect-src`               | Required |
| `cdn.jsdelivr.net`              | Emoji assets for OG images      | `script-src`, `img-src`     | Required |
| `fonts.googleapis.com`          | Google Fonts                    | `style-src`, `font-src`     | Optional |
| `www.googletagmanager.com`      | Google Analytics/GTM            | `script-src`, `connect-src` | Optional |
| `cdn.segment.com`               | Segment analytics               | `script-src`, `connect-src` | Optional |
| `plausible.io`                  | Plausible analytics             | `script-src`, `connect-src` | Optional |
| `us.posthog.com`                | PostHog analytics               | `connect-src`               | Optional |
| `tag.clearbitscripts.com`       | Clearbit tracking               | `script-src`                | Optional |
| `cdn.heapanalytics.com`         | Heap analytics                  | `script-src`                | Optional |
| `chat.cdn-plain.com`            | Plain chat widget               | `script-src`                | Optional |
| `chat-assets.frontapp.com`      | Front chat widget               | `script-src`                | Optional |
| `browser.sentry-cdn.com`        | Sentry error tracking           | `script-src`, `connect-src` | Optional |
| `js.sentry-cdn.com`             | Sentry JavaScript SDK           | `script-src`                | Optional |

## Example CSP configuration

<Note>
  Only include domains for services that you use. Remove any analytics domains that you have not configured for your documentation.
</Note>

```text wrap theme={null}
Content-Security-Policy:
default-src 'self';
script-src 'self' 'unsafe-inline' 'unsafe-eval' cdn.jsdelivr.net www.googletagmanager.com cdn.segment.com plausible.io
us.posthog.com tag.clearbitscripts.com cdn.heapanalytics.com chat.cdn-plain.com chat-assets.frontapp.com
browser.sentry-cdn.com js.sentry-cdn.com;
style-src 'self' 'unsafe-inline' d4tuoctqmanu0.cloudfront.net fonts.googleapis.com;
font-src 'self' d4tuoctqmanu0.cloudfront.net fonts.googleapis.com;
img-src 'self' data: blob: d3gk2c5xim1je2.cloudfront.net mintcdn.com *.mintcdn.com cdn.jsdelivr.net;
connect-src 'self' *.mintlify.dev *.mintlify.com d1ctpt7j8wusba.cloudfront.net mintcdn.com *.mintcdn.com
api.mintlifytrieve.com www.googletagmanager.com cdn.segment.com plausible.io us.posthog.com browser.sentry-cdn.com;
frame-src 'self' *.mintlify.dev;
```

## Common configurations by proxy type

Most reverse proxies support adding custom headers.

### Cloudflare configuration

Create a Response Header Transform Rule:

1. In your Cloudflare dashboard, go to **Rules > Overview**.
2. Select **Create rule > Response Header Transform Rule**.
3. Configure the rule:

* **Modify response header**: Set static
* **Header name**: `Content-Security-Policy`
* **Header value**:
  ```text wrap theme={null}
  default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' cdn.jsdelivr.net; style-src 'self' 'unsafe-inline' d4tuoctqmanu0.cloudfront.net fonts.googleapis.com; font-src 'self' d4tuoctqmanu0.cloudfront.net fonts.googleapis.com; img-src 'self' data: blob: d3gk2c5xim1je2.cloudfront.net mintcdn.com *.mintcdn.com cdn.jsdelivr.net; connect-src 'self' *.mintlify.dev *.mintlify.com d1ctpt7j8wusba.cloudfront.net mintcdn.com *.mintcdn.com api.mintlifytrieve.com; frame-src 'self' *.mintlify.dev;
  ```

4. Deploy your rule.

### AWS CloudFront configuration

Add a response headers policy in CloudFront:

```json theme={null}
{
"ResponseHeadersPolicy": {
    "Name": "MintlifyCSP",
    "Config": {
    "SecurityHeadersConfig": {
        "ContentSecurityPolicy": {
        "ContentSecurityPolicy": "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' cdn.jsdelivr.net; style-src 'self' 'unsafe-inline' d4tuoctqmanu0.cloudfront.net fonts.googleapis.com; font-src 'self' d4tuoctqmanu0.cloudfront.net fonts.googleapis.com; img-src 'self' data: blob: d3gk2c5xim1je2.cloudfront.net mintcdn.com *.mintcdn.com cdn.jsdelivr.net; connect-src 'self' *.mintlify.dev *.mintlify.com d1ctpt7j8wusba.cloudfront.net mintcdn.com *.mintcdn.com api.mintlifytrieve.com; frame-src 'self' *.mintlify.dev;",
        "Override": true
        }
      }
    }
  }
}
```

### Vercel configuration

Add to your `vercel.json`:

```json theme={null}
{
"headers": [
    {
    "source": "/(.*)",
    "headers": [
        {
        "key": "Content-Security-Policy",
        "value": "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' cdn.jsdelivr.net; style-src 'self' 'unsafe-inline' d4tuoctqmanu0.cloudfront.net fonts.googleapis.com; font-src 'self' d4tuoctqmanu0.cloudfront.net fonts.googleapis.com; img-src 'self' data: blob: d3gk2c5xim1je2.cloudfront.net mintcdn.com *.mintcdn.com cdn.jsdelivr.net; connect-src 'self' *.mintlify.dev *.mintlify.com d1ctpt7j8wusba.cloudfront.net mintcdn.com *.mintcdn.com api.mintlifytrieve.com; frame-src 'self' *.mintlify.dev;"
        }
      ]
    }
  ]
}
```

## Troubleshooting

Identify CSP violations in your browser console:

1. Open your browser's Developer Tools.
2. Go to the **Console** tab.
3. Look for errors starting with:
   * `Content Security Policy: The page's settings blocked the loading of a resource`
   * `Refused to load the script/stylesheet because it violates the following Content Security Policy directive`
   * `Refused to connect to because it violates the following Content Security Policy directive`