MS: Enable/Disable "Use HTTP 1.1 through proxy connections" settings in Internet Explorer

Change (or create) these registry keys or create ADM Template to apply using a GPO.

HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\EnableHttp1_1= "0x00000001"

HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyHttp1.1= "0x00000001"

1 is Enable and 0 is Disable.