Fix mixed content — load every resource over HTTPS

Mixed content — where an HTTPS page loads some resources like images, scripts, or stylesheets over plain, unencrypted HTTP — undermines the security guarantee your HTTPS implementation is meant to provide, since these individual unencrypted resource loads remain vulnerable to the same interception and tampering risks that comprehensive HTTPS enforcement is specifically meant to prevent.

Modern browsers increasingly block or warn about mixed content specifically because of this genuine security gap — an attacker positioned appropriately on the network could potentially intercept and modify these unencrypted resource loads, even on an otherwise properly secured HTTPS page, injecting malicious content through this specific gap in otherwise comprehensive encryption.

This issue commonly arises through legacy content or third-party integrations that were configured before your site fully transitioned to HTTPS, or through third-party services that themselves don't fully support HTTPS for all their resource delivery — identifying every instance of this mixed content requires genuinely thorough review of your page's actual resource loading, not simply confirming the page itself loads over HTTPS.

Remediation requires updating every identified instance to load over HTTPS instead — for resources from third-party services, this may require confirming that service actually offers HTTPS delivery, and in cases where a specific third-party resource genuinely cannot be loaded securely, considering whether that resource should be replaced with an alternative that does support proper HTTPS delivery.