HTTPS basic auth not working in Safari

[m-emelchenkov]

A setup where TLS web site has basic authentication enabled (access by login and password). Safari doesn't handle this setup correctly, there is an error in Console error log:

Blocked https://x.x.x.x/VAADIN/build/vaadin-bundle-36b849d75be21f7377ea.cache.js from asking for credentials because it is a cross-origin request.

Looks like the same issue: https://stackoverflow.com/questions/56557082/safari-blocked-https-from-asking-for-credentials-because-it-is-a-cross-o (not related to Vaadin but another framework with the same problem).

Versions:
Safari 13.0 on macOS High Sierra
Vaadin 14.0.5
Java 11