Angular js and AWS expert

Our backend is built with Angular 4 and it is deployed on AWS using Serverless. All things are working very well but we have very one small issue. If a custom header is added, it throws warning as follows.

"Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at [login to view URL] (Reason: missing token ‘app_version’ in CORS header ‘Access-Control-Allow-Headers’ from CORS preflight channel)."

"Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at [login to view URL] (Reason: CORS request did not succeed)."

The "app_version" is the custom header I added.

If I remove this custom header, all things are working fine.

I need help right now. For expert, it will not take longer than 30 minutes. As soon as the issue is resolved, I am going to pay immediately. Thanks.

Kemahiran: Angular.js, node.js, Amazon Web Services, Express JS

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ID Projek: #22254901