I’ve run into an issue where using the Domain Mapping plugin and the Net_URL2 pear package  which causes Net_URL2::getRequested to always return an https url.
When the domain mapping plugin is running and generating a mapped url it changes the value of $_SERVER[‘HTTPS’] to ‘off’ when it wasn’t set, this causes logic that is just looking for ‘HTTPS’ being set to return true even when the request was actually http.
The documentation for the variable states it should be “Set to a non-empty value if the script was queried through the HTTPS protocol.” There is a caveat that IIS sets it to off when it’s not an HTTPS request, but that caveat was addressed with this bug report
There is no real reason for the domain mapping plugin to actually have to change the state of the variable, here is a patch that updates the plugin to just examine the state of the variable and not update it’s value.
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