Avoiding Preflight calls

Question

I have frontend react app deployed in Az CDN and backend in Az App service. How can I avoid CORS issue i.e. avoiding preflight calls? Please suggest a solution.

Answer 1

@Anantha Subramanian Thank you for reaching out to Microsoft Q&A.

I see that you are facing CORS issues. As mentioned in our docs, For wildcard or single Origin scenarios,

CORS on Azure CDN will work automatically with no additional configuration when the Access-Control-Allow-Origin header is set to wildcard (*) or a single origin. The CDN will cache the first response and subsequent requests will use the same header.

If requests have already been made to the CDN prior to CORS being set on your origin, you will need to purge content on your endpoint content to reload the content with the Access-Control-Allow-Origin header.

For multi origin scenarios, please read this doc further to understand how to correct this. Here is how to handle CORS when using Azure CDN premium for Verizon.

Hope this helps.

Please let us know if you have any further questions and we will be glad to assist you further. Thank you!

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