Request an insecure XMLHttpRequest endpoint

I made a cusom tab where I call an API. The API is only available over HTTP.
My Umbraco is loaded over HTTPS.

I got the error, that reauest has been blocked, because it isn’t secure.

Error:

Mixed Content: The page at 'https://[my page]' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://[API-URL]'. This request has been blocked; the content must be served over HTTPS.

How can I call my API?


This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/110267-request-an-insecure-xmlhttprequest-endpoint