Power BI Custom Visual: TypeError: Failed to fetch

[kevinsql]

I'm creating a custom visual in Power BI. The custom visual does an https request. When I test my solution I get the following error: 'TypeError: Failed to fetch'. When I do the https request in a typescript solution outside Power BI it's working fine. Does anyone has experience in API calls in a custom visual in Power BI?

Thanks for your feedback!

[v-chuncz-msft]

@kevinsql 

You may check Access-Control-Allow-Origin response header and reach out to Custom Visuals Development Discussion.