In order to know the network protocol (HTTP, HTTPS, FTP, SMTP, SSH, FILE e.t.c) of the current page we can make use of the window.location.protocol object in Javascript,
var urlProtocol = window.location.protocol;
File: pageProtocol.html
<html>
<head>
<title>Get current page Protocol using JavaScript</title>
</head>
<body onload="getCurrentPageProtocol()">
<div id="pageDetails"></div>
<script>
function getCurrentPageProtocol() {
var currPageURL = window.location.protocol;
document.getElementById("pageDetails").innerHTML = "<strong>Current Page Protocol : </strong>" + currPageURL;
}
</script>
</body>
</html>
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