Detect HTTP or HTTPS then force HTTPS in JavaScript

Is there any way to detect HTTP or HTTPS and then force usage of HTTPS with JavaScript?

I have some codes for detecting the HTTP or HTTPS but I can't force it to use https: .

I'm using the window.location.protocol property to set whatever the site is to https: then refresh the page to hopefully reload a new https'ed URL loaded into the browser.

if (window.location.protocol != "https:") {
   window.location.protocol = "https:";
   window.location.reload();
}

Solution 1:

Try this

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

location.href = blah adds this redirect to the browser history. If the user hits the back button, they will be redirected back to the the same page. It is better to use location.replace as it doesn't add this redirect to the browser history.

Solution 2:

Setting location.protocol navigates to a new URL. No need to parse/slice anything.

if (location.protocol !== "https:") {
  location.protocol = "https:";
}

Firefox 49 has a bug where https works but https: does not. Said to be fixed in Firefox 54.