![]() This extension is disabled by default and should only be used while developing your code. Without this header, you will receive the following error message:Īccess to XMLHttpRequest at * from origin * has been blocked by CORS policy: Method *** is not allowed by Access-Control-Allow-Methods in preflight response. When this extension is enabled, it will add the header “Access-Control-Allow-Origin = *” to every network request, allowing you to use these methods without encountering any errors. By default, if the response to a request does not have the “Access-Control-Allow-Origin” header, the browser will not permit the use of the “XMLHttpRequest” or “fetch” method to access the resource content. The “Access-Control-Allow-Origin - Unblock” is a browser extension for developers to bypass CORS errors when the (development) server does not explicitly authorize them. What is the "Access-Control-Allow-Origin - Unblock" add-on and how can I use it? Prevent overwriting existing rules if needed.Enable or disable CORS access by pressing the action button.Check the right-click context menu on the action button to see all optional features. The color of the button indicates the current state of the extension. You can activate it by clicking on the action button when needed. The extension is deactivated by default to avoid accidental unblocking. ![]() The extension also provides an option to preserve already existing headers, and you can customize the allowed methods via the right-click context menu. With these headers in place, you can use the "XMLHttpRequest" and "fetch" functions to retrieve content or JSON objects. It achieves this by adding two headers to all network requests: it replaces the "Access-Control-Allow-Origin" header with the "*" value, which allows access from all origins, and it modifies the "access-control-allow-methods" header to include "GET", "PUT", "POST", "DELETE", "HEAD", "OPTIONS", "PATCH" methods. The "Access-Control-Allow-Origin - Unblock" extension eliminates the CORS restrictions imposed by your browser.
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