Content Relay – Push Pages and Posts from Staging to Live

Content Relay pushes one piece of content from staging to live, or from live back to staging or development, without a full database migration. It relays a single page, post or custom post type entry, with every translation and its media, between the environments of the same site, in either direction. Typical uses:

• A page built on staging is approved and has to go live on production.
• A page edited on production is needed on development to work on it with real content.
• A batch of posts written on one environment has to appear on another.

In each case you sync only that content, without copying a whole database or overwriting what else changed on the other site. Orders, form entries, users and settings on the live site are left alone. The theme must match. Content Relay only works between sites running the same theme at the same version. A different active theme or theme version blocks the relay; the same version with different theme files gives a warning. Deploy the theme first, then relay the content. The same plugin runs on both sites. The receiving site issues a key; the sending site stores it. From then on an administrator can hover an item in Pages (or any other content list switched on in the settings), choose Relay to…, review what the receiving site plans to do, and relay. Many posts can be relayed at once with WP-CLI. What a relay carries

• The page or post and every translation of it (WPML), with fields, meta, Yoast SEO data and its terms.
• The images and files it uses. The original upload is sent once; the receiving site regenerates the image sizes. A file with the same name but different bytes is saved under a new name, never overwritten.
• References inside the content: block attributes, ACF fields (images, files, galleries, posts, terms, users), image IDs in HTML, and links to the sending site, all rewritten to the receiving site's IDs and address.
• Terms the content is assigned to that the receiving site lacks, created in the right language.

Content is written byte for byte. Block markup is edited only where a reference changes; it is never re-serialized. Review before anything is written The receiving site plans every relay and answers with a list of what it will create, update, reuse or refuse, with a field, meta and content diff for anything it would replace. Nothing is written until an administrator approves that plan. If the receiving site changes in the meantime, the relay is refused and the plan must be approved again. Content that was edited on the receiving site since its last relay is blocked. It can be relayed with Overwrite, which keeps a backup. After a relay

• Object caches, WPML caches and Yoast indexables of the relayed posts are cleared.
• Page caches are purged for WP Rocket, LiteSpeed Cache, W3 Total Cache, WP Super Cache, SiteGround Optimizer and Breeze. Other cache layers can hook content_relay_purge_page_cache.
• The sending site fetches each relayed page from the receiving site and checks the HTTP status and address, <html lang>, the hreflang alternates, that no link still points at the sending site, and that its images load.
• Every relay is logged on both sites under Tools → Content Relay history and can be rolled back from either: what it replaced is restored and what it created is removed.

What a relay does not carry

• The theme. Deploy it first: a relay is blocked when the theme or its version differs.
• Comments.
• Menus, widgets, site options and plugin settings.
• User accounts. Authors are matched by login and fall back to the key's administrator.
• Content a page lists by query instead of by ID, such as "the latest events tagged with this page's term". A theme can declare such dependencies with the content_relay_query_dependencies filter; the receiving site then warns when they find nothing.
• Parent pages and referenced posts must already exist on the receiving site; the plan names any that are missing.
• Images held in ACF fields of a term the relay has to create are not relayed; those references are removed and reported.

Security

• Every request is signed with Ed25519 and carries a timestamp and a single-use nonce. Refused requests are rate-limited per IP.
• The receiving site keeps only the public half of a key; the key itself is shown once. The sending site stores it encrypted with CONTENT_RELAY_ENCRYPTION_KEY, or with the AUTH_KEY and SECURE_AUTH_KEY salts.
• A key can only relay content: posts, their media and their terms. A signed request is not logged in as any user and cannot manage users, plugins, themes or settings.
• Only administrators (manage_options) can relay, issue keys or add connections. A key stops working when it is revoked or when the administrator who issued it loses that role.
• The receiving site must use HTTPS.
• CONTENT_RELAY_IP_ALLOWLIST in wp-config.php limits which sending IPs are accepted.

Requirements and limits

• PHP 7.4 or later, WordPress 6.4 or later, InnoDB tables.
• WPML is supported; Polylang is not. ACF (including ACF blocks), core blocks and Yoast SEO are supported; Elementor content is not.
• A receiving site behind HTTP basic authentication is not supported yet.
• Tested on single sites.

Connections to other sites Content Relay contacts only the sites you connect it to with a key: it sends the relay to the receiving site and afterwards fetches the relayed pages from it to check them. It uses no third-party service, sends nothing to the plugin author and does no tracking. WP-CLI

• wp content-relay keys generate --label=<label> · keys list · keys revoke <kid> — on the receiving site.
• wp content-relay connections add <key> --label=<label> · connections list · connections test <label> · connections remove <label> — on the sending site.
• wp content-relay plan <page-id> --to=<label> — ask the receiving site for its plan without relaying.
• wp content-relay push <page-id> --to=<label> [--overwrite] [--flush-cache] [--yes] — relay, then check the pages.
• wp content-relay push-many [<id>...] --to=<label> [--post_type=<type>] [--tag=<slug>] [--category=<slug>] [--all] [--dry-run] — relay many posts, one translation group at a time.
• wp content-relay verify <session> — check a relay's pages again.
• wp content-relay rollback <session> --to=<label> — roll back a relay sent to another site; without --to, a relay received here.
• wp content-relay history [--direction=out|in] [--offline]
• wp content-relay discover <page-id> · bundle <page-id> · plan <dir> · apply <dir> — an offline bundle, written to uploads/content-relay/bundles/, for sites that cannot reach each other.

Hooks

• content_relay_post_types — post types that can be relayed (default: pages).
• content_relay_meta_denylist — meta keys never relayed.
• content_relay_resolvers — reference resolvers used to discover what a page needs.
• content_relay_query_dependencies — content a page lists by query, checked after a relay.
• content_relay_page_cache_integrations, content_relay_purge_page_cache — page-cache purging.
• content_relay_before_commit, content_relay_applied — around the content commit on the receiving site.
• content_relay_request_denied — a refused relay request.
• content_relay_http_args, content_relay_max_chunk_bytes — transport tuning.

1. Install and activate Content Relay on both sites.
2. On the receiving site, open Settings → Content Relay, switch Receiving on and issue a key. Copy it: it is shown once.
3. On the sending site, open Settings → Content Relay, switch Sending on and add a connection by pasting the key. A handshake checks it before it is stored.
4. Deploy the same theme, at the same version, to both sites.
5. On the sending site, hover a page in Pages and choose Relay to…. To relay posts or custom post types as well, tick them under Settings → Content Relay.

Sending and receiving can also be pinned in wp-config.php with define( 'CONTENT_RELAY_SEND', true ); and define( 'CONTENT_RELAY_RECEIVE', true ); (or false). A defined constant overrides the switch and locks it.

1.0.0

• Renamed from Page Relay to Content Relay: the plugin relays posts and custom post types as well as pages. Options, hooks, constants, the REST routes and the WP-CLI command are now named content_relay / content-relay; data stored under the old names is not migrated.
• A Settings link on the plugin's row of the Plugins screen.
• Tested with WordPress 7.1.

0.2.0

• wp content-relay push-many: relay many posts at once (by ids, --tag, --category or --all, matched in every language), one translation group per session, with --dry-run, --existing=update|skip, --media-fallback and --skip-missing-media.
• Settings: choose the relayable post types (pages by default).
• References the sender cannot resolve — deleted posts, revisions, terms of unregistered taxonomies, skipped media — are dropped (mapped to 0) instead of blocking the relay.
• Duplicates on the receiver (same file or same address) are resolved by the sender's own id on sites cloned from one database; a referenced post with no language is found by its address.
• Fixed: a re-relay of a post with dropped references no longer reports it as changed.

0.1.0

• First release: keys and connections, the relay screen with plan and diffs, page-cache purging, checks after a relay, history with rollback on both sites, WP-CLI commands and offline bundles.