CORS Unblock

CORS Unblock is a powerful Chrome extension designed to eliminate CORS (Cross-Origin Resource Sharing) errors by appending and modifying HTTP headers such as Access-Control-Allow-Origin and Access-Control-Allow-Methods for local and remote web requests. Simply activate it via the action button to bypass XMLHttpRequest and fetch rejections, facilitating seamless cross-origin API calls during development.

Beyond fixing CORS issues, this extension offers advanced features like removing Content Security Policy (CSP) headers, overwriting 4xx server responses to simulate supported methods, enabling SharedArrayBuffer support, allowing cross-origin iframe embedding by removing X-Frame-Options, and customizing sensitive headers like referer and origin. It optionally leverages Chrome's debugging API to fix redirected URLs and preflight requests, making it an essential tool for developers working with complex web applications and cross-origin resource access.