blocked by CORS policy, preflight request no 'Access-Control-Allow-Origin' header Error

I am completely stomped here. My function works perfectly with curl and postman but I just can’t invoke it using the REST API endpoints from browser.

Access to XMLHttpRequest at 'https://Myfunction' from origin 'https://someURL' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

any ideas?

Submit an answer
Answer a question...

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Hello, I am having the same problem, any solution?

Did you manage to solve this? I am having the same problem

Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in Q&A, subscribe to topics of interest, and get courses and tools that will help you grow as a developer and scale your project or business.

Bobby Iliev
Site Moderator
Site Moderator badge
July 21, 2022

Hi there,

Is your serverless function deployed as part of an App under the App Platform?

If this is the case, you need to the List of Approved Origins. To do that go to, click on your app, click Settings, and click the resource whose CORS policies you would like to edit. Under the CORS Policy heading, you will be able to add an origin and specify which match type to use.

Let me know how it goes!