Error while posting with a TypeScript API on Ionic

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I am developing an API in flask and trying to make a POST request with ionic gives the following error:

Error:

Failed to load http://127.0.0.1:5000/login: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8100' is therefore not allowed access.

Could someone tell me why this happens?

I know it has something to do with Access-Control-Allow-Origin, but I have no idea where to put it.

I also accept any referral link.

    
asked by anonymous 21.06.2018 / 15:06

0 answers