From acacbbe34e341fb2e5b4825b506f6d16e6fd0858 Mon Sep 17 00:00:00 2001
From: Adnan Haque <3737780+haqadn@users.noreply.github.com>
Date: Fri, 20 Dec 2024 17:11:15 -0500
Subject: [PATCH] Boost: Add edge-cache header on WP Cloud (#40557)

* Add edge-cache header on atomic

* changelog

* Update atomic check

* Add edge-cache header when uncached as well
---
 .../plugins/boost/app/lib/minify/functions-service.php    | 8 ++++++++
 projects/plugins/boost/changelog/add-edge-cache-header    | 4 ++++
 2 files changed, 12 insertions(+)
 create mode 100644 projects/plugins/boost/changelog/add-edge-cache-header

diff --git a/projects/plugins/boost/app/lib/minify/functions-service.php b/projects/plugins/boost/app/lib/minify/functions-service.php
index 20812b65b62d2..08fbd8997447d 100644
--- a/projects/plugins/boost/app/lib/minify/functions-service.php
+++ b/projects/plugins/boost/app/lib/minify/functions-service.php
@@ -60,6 +60,10 @@ function jetpack_boost_page_optimize_service_request() {
 			// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents
 			$etag = '"' . md5( file_get_contents( $cache_file ) ) . '"';
 
+			// Check if we're on Atomic and take advantage of the Atomic Edge Cache.
+			if ( defined( 'ATOMIC_CLIENT_ID' ) ) {
+				header( 'A8c-Edge-Cache: cache' );
+			}
 			header( 'X-Page-Optimize: cached' );
 			header( 'Cache-Control: max-age=' . 31536000 );
 			header( 'ETag: ' . $etag );
@@ -77,6 +81,10 @@ function jetpack_boost_page_optimize_service_request() {
 	foreach ( $headers as $header ) {
 		header( $header );
 	}
+	// Check if we're on Atomic and take advantage of the Atomic Edge Cache.
+	if ( defined( 'ATOMIC_CLIENT_ID' ) ) {
+		header( 'A8c-Edge-Cache: cache' );
+	}
 	header( 'X-Page-Optimize: uncached' );
 	header( 'Cache-Control: max-age=' . 31536000 );
 	header( 'ETag: "' . md5( $content ) . '"' );
diff --git a/projects/plugins/boost/changelog/add-edge-cache-header b/projects/plugins/boost/changelog/add-edge-cache-header
new file mode 100644
index 0000000000000..534f4a2e449ff
--- /dev/null
+++ b/projects/plugins/boost/changelog/add-edge-cache-header
@@ -0,0 +1,4 @@
+Significance: patch
+Type: added
+
+Minify: Added HTTP header to take advantage of WordPress.com edge caching