Mixed Content Warnings (HTTP/HTTPS) in WordPress

Description
After enabling SSL, some resources are still loaded over HTTP, causing "mixed content" warnings.

Causes
Hardcoded HTTP URLs in theme or plugins.

Solution

• Use a Plugin
  Install and configure the "Really Simple SSL" plugin.

• Update Database URLs
  Use the "Better Search Replace" plugin or run the following SQL query
  

UPDATE wp_options SET option_value = replace(option_value, 'http://yourdomain.com', 'https://yourdomain.com') WHERE option_name = 'home' OR option_name = 'siteurl';
UPDATE wp_posts SET post_content = replace(post_content, 'http://yourdomain.com', 'https://yourdomain.com');
UPDATE wp_postmeta SET meta_value = replace(meta_value, 'http://yourdomain.com', 'https://yourdomain.com');

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