When initial HTML is loaded via a secure HTTPS connection, but further resources (such as photos, videos, stylesheets, and scripts) are loaded over an insecure HTTP connection, mixed content occurs. Because both HTTP and HTTPS content is being loaded to display the same page, this is known as mixed content, and the initial request was secure through HTTPS.
Using the insecure HTTP protocol to request subresources degrades the security of the entire website since these requests are subject to on-path attacks, in which an attacker eavesdrops on a network connection and observes or alters the communication between two parties. Using these resources, attackers may follow visitors and alter material on a website, and in the case of active mixed content, they can take entire control of the page, not just the unsafe resources.
Although many browsers display mixed content warnings to the user, by then it is too late: the unsafe requests have already been sent, and the page’s security has been compromised.
As a result, browsers are increasingly preventing mixed content. If your site has mixed content, addressing it will ensure that the material continues to load as browsers grow more stringent.
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