Get ready to learn how to set CORS header in Cloudflare Workers. Our Cloudflare Support team is here to lend a hand with your queries and issues.

Cloudflare workers & CORS headers | An Introduction

Cross-Origin Resource Sharing or CORS can be described as a security feature that prevents web applications from accessing resources on a different domain. In order to allow cross-origin requests, we can set the CORS headers on the server to allow certain domains to make requests to our API.

Furthermore, Cloudflare Workers allow us to add custom logic to the website and control the response headers. Let’s take a look at Here’s how to set the CORS headers in a Cloudflare Worker:

1. First head to Manage Worker under Workers on the domain page.
2. Then, click Create Worker.
3. After that, add a name for the worker.
4. Next, add the following code:

   

    

5. Then, click Save and Deploy.
6. Next, click Add Route in the Workers section on the domain page.
7. After that, we have to set up routes that require the CORS worker and choose the worker we created earlier. Our experts recommend selecting only those paths that really need CORS access for security reasons.

Once the above steps are completed. Further requests to these paths will trigger the work. Our experts would like to remind us that the Cloudflare proxy has to be enabled in the DNS entry for this to succeed.

In conclusion, setting a Cloudflare workers CORS headers is a straightforward process that can help you secure your API and prevent cross-site scripting (XSS) attacks. By allowing only trusted domains to make requests to your API, you can ensure the privacy and security of your users’ data.

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Conclusion

To sum up, our Support Techs demonstrated how to set CORS header in Cloudflare Workers.