# CORS Header Generator

> Configure Access-Control-Allow-* Headers & Server Snippets

Free CORS header generator. Configure allowed origins, methods, headers, credentials. Generate Nginx, Apache, Express, Flask, Cloudflare Workers snippets. Preflight simulation. AI gets CORS wrong - we don't.

URL: https://tools.scoreroute.com/tools/cors-header-generator/

Markdown: https://tools.scoreroute.com/tools/cors-header-generator/.md

## CORS Configuration

One per line. Subdomain matching not automatic — add each subdomain separately.

## Generated Output

Generate config for Nginx, Apache, Express.js, Flask, and Cloudflare Workers — copy-paste ready.

## What Is CORS?

Cross-Origin Resource Sharing (CORS) is a browser security mechanism that controls how web pages from one origin can request resources from a different origin. Without CORS headers, browsers block cross-origin requests by default (Same-Origin Policy).

## How to Use

## Frequently Asked Questions

Cross-Origin Resource Sharing. It's a browser security mechanism that uses HTTP headers to tell browsers whether a web application running at one origin can access resources from a different origin.

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