How to Resolve WordPress Mixed Content Errors After Switching to HTTPS
WordPress sites migrated to HTTPS can still display a 'Not Secure' browser warning when images, scripts, or stylesheets are loaded over insecure HTTP — a problem known as mixed content. The root cause is typically old HTTP URLs stored in the WordPress database or hardcoded in themes and plugins. Developers can identify affected resources using browser developer tools and fix them by running a serialized-safe database search-and-replace, either via a plugin like Really Simple SSL or Better Search Replace. It is also recommended to configure server-level HTTP-to-HTTPS redirects and to back up both the database and .htaccess file before making changes. After applying fixes, all caches — including WordPress, server, CDN, and browser — should be cleared to ensure updated URLs are served correctly.
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