Computer Configuration > Administrative Templates > Microsoft Edge WebView2
Both
HKLM\Software\Policies\Microsoft\Edge\WebView2
Setting the policy specifies a list of hostnames or hostname patterns (such as '[*.]example.com') that won't be upgraded to HTTPS. Organizations can use this policy to maintain access to servers that don't support HTTPS, without needing to disable "HttpsUpgradesEnabled". Supplied hostnames must be canonicalized: Any IDNs must be converted to their A-label format, and all ASCII letters must be lowercase. Blanket host wildcards (that is, "*" or "[*]") aren't allowed. Instead, HTTPS-First Mode and HTTPS Upgrades should be explicitly disabled via their specific policies. Note: This policy doesn't apply to HSTS upgrades. Example value: testserver.example.com [*.]example.org