How to Securely Load CSS and JS Files via HTTPS?

Loading CSS and JS Files Securely via HTTPS

When incorporating external CSS and JS files into web pages, it's crucial to ensure secure loading when the parent page is accessed via HTTPS. Some browsers raise concerns about insecure content when an HTTPS page references external content using HTTP protocol.

Solution: Using Protocol-Relative Paths

To address this issue, developers can employ protocol-relative paths. Instead of specifying the exact HTTP or HTTPS protocol, use the following format:

<link rel="stylesheet" href="//example.com/style.css">
<script src="//example.com/script.js"></script>

By using double forward-slashes (//) as the protocol placeholder, the browser will automatically use the same protocol as the parent page. This ensures that the external assets are loaded securely when the page is accessed via HTTPS.

Avoid using the full HTTP protocol specification, as shown below:

<link rel="stylesheet" href="http://example.com/style.css">
<script src="http://example.com/script.js"></script>

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