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To host your documentation at a subpath such as yoursite.com/docs using Cloudflare, you must create and configure a Cloudflare Worker.
Before you begin, you need a Cloudflare account and a domain name (managed on or off Cloudflare).

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Set your base path

  1. Navigate to the Custom domain setup page in your dashboard.
  2. Enable the Host at toggle.
  3. Enter your domain.
  4. Enter your base path. For example, /docs or /help.
  5. Click Add domain.
The dashboard displays a Cloudflare Worker script with your subdomain, domain, and base path filled in. Use this script in the Configure routing step instead of manually replacing the placeholder values in the example script.

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Set up a Worker

Create a Cloudflare Worker by following the Cloudflare Workers getting started guide, if you have not already.
If your DNS provider is Cloudflare, disable proxying for the CNAME record to avoid potential configuration issues.

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Proxies with Vercel deployments

If you use Cloudflare as a proxy with Vercel deployments, you must ensure proper configuration to avoid conflicts with Vercel’s domain verification and SSL certificate provisioning. Improper proxy configuration can prevent Vercel from provisioning Let’s Encrypt SSL certificates and cause domain verification failures.

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Required path allowlist

Your Cloudflare Worker must allow traffic to these specific paths without blocking or redirecting:
  • /.well-known/acme-challenge/* - Required for Let’s Encrypt certificate verification
  • /.well-known/vercel/* - Required for Vercel domain verification
While Cloudflare automatically handles many verification rules, creating additional custom rules may inadvertently block this critical traffic.

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Header forwarding requirements

Ensure that your Worker sets the Host header to your <subdomain>.mintlify.site target, as shown in the example script, rather than passing through the original request’s Host header. Incorrect Host headers cause verification requests to fail.

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Configure routing

In your Cloudflare dashboard, click Edit Code and add the script from your Custom domain setup page, which has your values filled in, or copy the following example script. See the Cloudflare documentation for more information on editing a Worker.
If you use the example script, replace [SUBDOMAIN] with your unique subdomain, [YOUR_DOMAIN] with your website’s base URL, and /docs with your desired subpath if different.
addEventListener("fetch", (event) => {
  event.respondWith(handleRequest(event.request));
});

async function handleRequest(request) {
  try {
    const urlObject = new URL(request.url);
    
    // If the request is to a Vercel verification path, allow it to pass through
    if (urlObject.pathname.startsWith('/.well-known/')) {
      return await fetch(request);
    }
    
    // If the request is to the docs subpath
    if (/^\/docs/.test(urlObject.pathname)) {
      // Then Proxy to Mintlify
      const DOCS_URL = "[SUBDOMAIN].mintlify.site";
      const CUSTOM_URL = "[YOUR_DOMAIN]";

      let url = new URL(request.url);
      url.hostname = DOCS_URL;

      let proxyRequest = new Request(url, request);

      proxyRequest.headers.set("Host", DOCS_URL);
      proxyRequest.headers.set("X-Forwarded-Host", CUSTOM_URL);
      proxyRequest.headers.set("X-Forwarded-Proto", "https");
      // If deploying to Vercel, preserve client IP
      proxyRequest.headers.set("CF-Connecting-IP", request.headers.get("CF-Connecting-IP"));

      return await fetch(proxyRequest);
    }
  } catch (error) {
    // If no action found, play the regular request
    return await fetch(request);
  }
}
Click Deploy and wait for the changes to propagate.
After you deploy your changes, your documentation is usually available at your subpath within a few minutes. If your setup includes DNS changes, propagation can take 1-4 hours, and in rare cases up to 48 hours. If your documentation is not immediately available, wait before troubleshooting.

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Test your Worker

After your code deploys, test your Worker to ensure it routes to your Mintlify docs.
  1. Test using the Worker’s preview URL: your-worker.your-subdomain.workers.dev/docs
  2. Verify the Worker routes to your Mintlify docs and your website.

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Add custom domain

  1. In your Cloudflare dashboard, navigate to your Worker.
  2. Go to Settings > Domains & Routes > Add > Custom Domain.
  3. Add your domain.
Add your domain both with and without www. prepended.
See Add a custom domain in the Cloudflare documentation for more information.

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Resolve DNS conflicts

If your domain already points to another service, you must remove the existing DNS record. Your Cloudflare Worker must control all traffic for your domain.
  1. Delete the existing DNS record for your domain. See Delete DNS records in the Cloudflare documentation for more information.
  2. Return to your Worker and add your custom domain.

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Webflow custom routing

If you use Webflow to host your main site and want to serve Mintlify docs at /docs on the same domain, configure custom routing through Cloudflare Workers. The Worker proxies all non-docs traffic to your main site.
Set up your main site on a landing page before deploying this Worker, or visitors to your main site may see errors.
  1. In Webflow, set up a landing page for your main site like landing.yoursite.com. This is the page that visitors see when they visit your site.
  2. Deploy your main site to the landing page. This ensures that your main site remains accessible while you configure the Worker.
  3. To avoid conflicts, update any absolute URLs in your main site to be relative.
  4. In Cloudflare, click Edit Code and add the following script into your Worker’s code.
Replace [SUBDOMAIN] with your unique subdomain, [YOUR_DOMAIN] with your website’s base URL, [LANDING_DOMAIN] with your landing page URL, and /docs with your desired subpath if different. 
addEventListener("fetch", (event) => {
event.respondWith(handleRequest(event.request));
});
async function handleRequest(request) {
try {
  const urlObject = new URL(request.url);
  
  // If the request is to a Vercel verification path, allow it to pass through
  if (urlObject.pathname.startsWith('/.well-known/')) {
    return await fetch(request);
  }
  
  // If the request is to the docs subpath
  if (/^\/docs/.test(urlObject.pathname)) {
    // Proxy to Mintlify
    const DOCS_URL = "[SUBDOMAIN].mintlify.site";
    const CUSTOM_URL = "[YOUR_DOMAIN]";
    let url = new URL(request.url);
    url.hostname = DOCS_URL;
    let proxyRequest = new Request(url, request);
    proxyRequest.headers.set("Host", DOCS_URL);
    proxyRequest.headers.set("X-Forwarded-Host", CUSTOM_URL);
    proxyRequest.headers.set("X-Forwarded-Proto", "https");
    // If deploying to Vercel, preserve client IP
    proxyRequest.headers.set("CF-Connecting-IP", request.headers.get("CF-Connecting-IP"));
    return await fetch(proxyRequest);
  }
  // Route everything else to main site
  const MAIN_SITE_URL = "[LANDING_DOMAIN]";
  if (MAIN_SITE_URL && MAIN_SITE_URL !== "[LANDING_DOMAIN]") {
    let mainSiteUrl = new URL(request.url);
    mainSiteUrl.hostname = MAIN_SITE_URL;
    return await fetch(mainSiteUrl, {
      method: request.method,
      headers: request.headers,
      body: request.body
    });
  }
} catch (error) {
  // If no action found, serve the regular request
  return await fetch(request);
}
}
  1. Click Deploy and wait for the changes to propagate.
After you deploy your changes, your documentation is usually available at your subpath within a few minutes. If your setup includes DNS changes, propagation can take 1-4 hours, and in rare cases up to 48 hours. If your documentation is not immediately available, wait before troubleshooting.