Unable to use track API due to CORS error

  • 10 June 2020
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  • New Participant
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My website has been created using Flutter and is hosted in a subdomain (e.g. and on my frontend I am calling the track endpoint to send data to Mixpanel, unfortunately I get a CORS error like the following:

Access to fetch at '[...]' from origin '' has been blocked by CORS policy: Request header field access-control-allow-origin is not allowed by Access-Control-Allow-Headers in preflight response.


I checked the following support pages


But none helped, how can I fix this problem?


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