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?

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

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

Bobby Iliev
Site Moderator
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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!



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