mintlify__docs/deploy/csp-configuration.mdx

---
title: "Content Security Policy (CSP) configuration"
sidebarTitle: "CSP configuration"
description: "Configure CSP headers to allow Mintlify resources while maintaining security for reverse proxies, firewalls, and networks that enforce strict security policies."
keywords: ["Content Security Policy", "CSP directives", "security headers", "XSS prevention"]
---

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 |
| `mintlify.s3.us-west-1.amazonaws.com` | S3-hosted images | `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
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 mintlify.s3.us-west-1.amazonaws.com;
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
    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 mintlify.s3.us-west-1.amazonaws.com; 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
{
"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 mintlify.s3.us-west-1.amazonaws.com; 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
{
"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 mintlify.s3.us-west-1.amazonaws.com; 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`