Manual:$wgSecureLoginDefaultHTTPS

Special pages: $wgSecureLoginDefaultHTTPS
Keep users logged in via HTTPS
Introduced in version:1.21.0 (Gerrit change 45715; git #Ie846d2d)
Removed in version:1.22.0 (Gerrit change 80334; git #c99b0dca)
Allowed values:(boolean)
Default value:true

Details edit

By default, keep users logged in via HTTPS when $wgSecureLogin is also true. Users opt-out of HTTPS when they login by de-selecting the checkbox.