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Simple WordPress Maintenance Mode Without a Plugin
Put WordPress into maintenance mode without a plugin: visitors get a 503 page with Retry-After, administrators keep using the site.
3rd party plugins actions admin archive block-themes block editor Blocks body-class build capabilities core CPT CSS Custom Post custom post types Developer development filters Front End full site editing gutenberg hook Image img load styles maintenance media mu-plugin Must Have npm Oxygen performance php plugins repeater scripts organizer security SEO single product Taxonomy Tips updates WooCommerce wordpress WP Admin