Featured
| CARVIEW |
Select Language
HTTP/2 200
date: Sun, 01 Feb 2026 22:49:36 GMT
content-type: text/html
content-encoding: gzip
cf-cache-status: HIT
access-control-allow-origin: *
cache-control: public, max-age=0, must-revalidate
set-cookie: __cf_bm=HHFcvBG_9.e_KnkweF72m0uQGoR9dz5B00.phsjLP9Y-1769986176-1.0.1.1-HJWEoSwRRL4qka8gNoFCVlyzZtS9EDv9o2XvUcV3RbQVhkyo47RWwEhGaASrJX3xFHiOgsl0gR0WiUVNaT4Pxa2i8ZNUp1.3zaMgF25lmqw; path=/; expires=Sun, 01-Feb-26 23:19:36 GMT; domain=.developers.cloudflare.com; HttpOnly; Secure; SameSite=None
vary: Accept-Encoding
strict-transport-security: max-age=15552000; preload
x-content-type-options: nosniff
speculation-rules: "/cdn-cgi/speculation"
server: cloudflare
cf-ray: 9c7500c08a33f473-BLR
alt-svc: h3=":443"; ma=86400
Welcome to Cloudflare | Cloudflare Docs
Skip to content 
JavaScript JavaScript JavaScript JavaScript JavaScript
Developer Products
AI Products
Zero Trust
Build with Cloudflare
export default { async fetch(request) { const html = `<!DOCTYPE html> <body> <h1>Hello World</h1> <p>This markup was generated by a Cloudflare Worker.</p> </body>`;
return new Response(html, { headers: { "content-type": "text/html;charset=UTF-8", }, }); },};export default { async fetch(request) { const data = { hello: "world", };
return Response.json(data); },};export default { async fetch(request) { /** * Replace `remote` with the host you wish to send requests to */ const remote = "https://example.com";
return await fetch(remote, request); },};export default { async fetch(request) { const destinationURL = "https://example.com"; const statusCode = 301; return Response.redirect(destinationURL, statusCode); },};export default { async fetch(request) { function MethodNotAllowed(request) { return new Response(`Method ${request.method} not allowed.`, { status: 405, headers: { Allow: "GET", }, }); } // Only GET requests work with this proxy. if (request.method !== "GET") return MethodNotAllowed(request); return fetch(`https://example.com`); },};Developer Platform
The Cloudflare Developer Platform provides a serverless execution environment that allows you to create entirely new applications or augment existing ones without configuring or maintaining infrastructure.
Install the WARP Client
The Cloudflare WARP client allows individuals and organizations to have a faster, more secure, and more private experience online.
Set up a tunnel
Cloudflare Tunnel provides you with a secure way to connect your resources to Cloudflare without a publicly routable IP address.
Zero Trust
Cloudflare Zero Trust replaces legacy security perimeters with our global network, making the Internet faster and safer for teams around the world.
Other docs you might also like
Install an Origin CA certificate
Use Origin Certificate Authority (CA) certificates to encrypt traffic between Cloudflare and your origin web server and reduce origin bandwidth.
Change your nameservers
Make Cloudflare your primary DNS provider by updating your authoritative nameservers at your domain registrar.
SSL/TLS Encryption mode
Your domain's encryption mode controls how Cloudflare connects to your origin server and how SSL certificates at your origin will be validated.
Allow traffic from specific countries only
Block requests based on a list of allowed countries by configuring a custom rule in the Web Application Firewall (WAF).
Community
Share ideas, answers, code and compare notes with the Cloudflare community.
Open source
Cloudflare contributes to the open-source ecosystem in a variety of ways, including:
Blog
Get the latest news on Cloudflare products, technologies, and culture.
- Resources
- API
- New to Cloudflare?
- Directory
- Sponsorships
- Open Source
- Support
- Help Center
- System Status
- Compliance
- GDPR
- Company
- cloudflare.com
- Our team
- Careers
- © 2026 Cloudflare, Inc.
- Privacy Policy
- Terms of Use
- Report Security Issues
- Trademark
-
