How To: Redirect HTTP url to HTTPS using JavaScript/PHP/Apache

How to force HTTPS using JavaScript ?

You can use location.protocol in JavaScript to detect the protocol of current URL and then use location.replace property to redirect the current URL to HTTPS page.

JavaScript Code to force HTTPs usage.

<script type="text/javascript">

if (location.protocol !== 'https:') {
    location.replace(`https:${location.href.substring(location.protocol.length)}`);
}

</script>

PHP script to redirect/force HTTP to HTTPS

<?php

if(!isset($_SERVER["HTTPS"]) || $_SERVER["HTTPS"] != "on")
{
	$https_url= "https://" . $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]";
	header("Location: ". $https_url.", true, 301);
	exit();
}

?>

Forcing HTTPS using .htaccess

Copy and paste this code to redirect HTTP to HTTPS in Apache web server

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}