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If you site’s running on both HTTP and HTTPS, we will need to determine whether the HTTP protocol for the requested page is either secure (HTTPS) or standard (HTTP) to load/write the appropriate external assets files or handle process correspondingly.

1. JavaScript Detect Protocol To Load External File

A piece of JavaScript below gives an example to detect the protocol of current page to load the appropriate Google Analytics js file:

<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>

2. JavaScript Detect Protocol To Handle Process Accordingly

JavaScript code below detects protocol to respond accordingly.

<script type="text/javascript">
	if("https:" == document.location.protocol)
	{
		document.write("<h2>The page is loaded via HTTPS</h2>");
 
		// your code for HTTPS ...
	}
	else
	{
		document.write("<h2>The page is loaded via HTTP</h2>");
 
		// your code for HTTP ...
	}
</script>

3. Demonstration

+ HTTPS: https://4rapiddev.com/demo/HTML/load_http_https.html

+ HTTP: http://4rapiddev.com/demo/HTML/load_http_https.html