Getting protocol from the URL in controller

You can use this in your controller :

$scheme = $this->getRequest()->getScheme();

Otherwise, here is a code allowing you to know all the values returned by the server:

 foreach ($_SERVER as $key => $value) {
      echo $key.' => '.$value.'<br>';
    }

To check if request is https use:

$request->isSecure()

Check doc for more info

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