diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
index 43fd8d3b29..2e093f6656 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
@@ -307,7 +307,7 @@ class WP_REST_Autosaves_Controller extends WP_REST_Revisions_Controller {
 
 		if ( $request->is_method( 'HEAD' ) ) {
 			// Return early as this handler doesn't add any response headers.
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 		$response  = array();
 		$parent_id = $parent->ID;
@@ -455,7 +455,7 @@ class WP_REST_Autosaves_Controller extends WP_REST_Revisions_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php */
-			return apply_filters( 'rest_prepare_autosave', new WP_REST_Response(), $post, $request );
+			return apply_filters( 'rest_prepare_autosave', new WP_REST_Response( array() ), $post, $request );
 		}
 		$response = $this->revisions_controller->prepare_item_for_response( $post, $request );
 		$fields   = $this->get_fields_for_response( $request );
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-block-pattern-categories-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-block-pattern-categories-controller.php
index 86ee4cdc52..17efc869f8 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-block-pattern-categories-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-block-pattern-categories-controller.php
@@ -83,7 +83,7 @@ class WP_REST_Block_Pattern_Categories_Controller extends WP_REST_Controller {
 	public function get_items( $request ) {
 		if ( $request->is_method( 'HEAD' ) ) {
 			// Return early as this handler doesn't add any response headers.
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 
 		$response   = array();
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php
index f167d72255..9b099a44a2 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php
@@ -133,7 +133,7 @@ class WP_REST_Block_Types_Controller extends WP_REST_Controller {
 	public function get_items( $request ) {
 		if ( $request->is_method( 'HEAD' ) ) {
 			// Return early as this handler doesn't add any response headers.
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 
 		$data        = array();
@@ -258,7 +258,7 @@ class WP_REST_Block_Types_Controller extends WP_REST_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php */
-			return apply_filters( 'rest_prepare_block_type', new WP_REST_Response(), $block_type, $request );
+			return apply_filters( 'rest_prepare_block_type', new WP_REST_Response( array() ), $block_type, $request );
 		}
 
 		$fields = $this->get_fields_for_response( $request );
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
index 57214ef62e..a0b68759f9 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
@@ -313,7 +313,7 @@ class WP_REST_Comments_Controller extends WP_REST_Controller {
 			$max_pages      = (int) ceil( $total_comments / $request['per_page'] );
 		}
 
-		$response = $is_head_request ? new WP_REST_Response() : rest_ensure_response( $comments );
+		$response = $is_head_request ? new WP_REST_Response( array() ) : rest_ensure_response( $comments );
 		$response->header( 'X-WP-Total', $total_comments );
 		$response->header( 'X-WP-TotalPages', $max_pages );
 
@@ -1054,7 +1054,7 @@ class WP_REST_Comments_Controller extends WP_REST_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php */
-			return apply_filters( 'rest_prepare_comment', new WP_REST_Response(), $comment, $request );
+			return apply_filters( 'rest_prepare_comment', new WP_REST_Response( array() ), $comment, $request );
 		}
 
 		$fields = $this->get_fields_for_response( $request );
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-font-collections-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-font-collections-controller.php
index 476f1b750f..3a726681f0 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-font-collections-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-font-collections-controller.php
@@ -113,7 +113,7 @@ class WP_REST_Font_Collections_Controller extends WP_REST_Controller {
 			$items[] = $item;
 		}
 
-		$response = $is_head_request ? new WP_REST_Response() : rest_ensure_response( $items );
+		$response = $is_head_request ? new WP_REST_Response( array() ) : rest_ensure_response( $items );
 
 		$response->header( 'X-WP-Total', (int) $total_items );
 		$response->header( 'X-WP-TotalPages', $max_pages );
@@ -193,7 +193,7 @@ class WP_REST_Font_Collections_Controller extends WP_REST_Controller {
 			 */
 			if ( $request->is_method( 'HEAD' ) ) {
 				/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-font-collections-controller.php */
-				return apply_filters( 'rest_prepare_font_collection', new WP_REST_Response(), $item, $request );
+				return apply_filters( 'rest_prepare_font_collection', new WP_REST_Response( array() ), $item, $request );
 			}
 
 			foreach ( $data_fields as $field ) {
@@ -209,7 +209,7 @@ class WP_REST_Font_Collections_Controller extends WP_REST_Controller {
 		 */
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-font-collections-controller.php */
-			return apply_filters( 'rest_prepare_font_collection', new WP_REST_Response(), $item, $request );
+			return apply_filters( 'rest_prepare_font_collection', new WP_REST_Response( array() ), $item, $request );
 		}
 
 		$response = rest_ensure_response( $data );
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-revisions-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-revisions-controller.php
index e214ab6d39..b80b8d8812 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-revisions-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-revisions-controller.php
@@ -248,7 +248,7 @@ class WP_REST_Global_Styles_Revisions_Controller extends WP_REST_Revisions_Contr
 
 			$response = rest_ensure_response( $response );
 		} else {
-			$response = new WP_REST_Response();
+			$response = new WP_REST_Response( array() );
 		}
 
 		$response->header( 'X-WP-Total', (int) $total_revisions );
@@ -291,7 +291,7 @@ class WP_REST_Global_Styles_Revisions_Controller extends WP_REST_Revisions_Contr
 	public function prepare_item_for_response( $post, $request ) {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 
 		$parent               = $this->get_parent( $request['parent'] );
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php
index 4dda8b3455..bec92f1c7e 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php
@@ -163,7 +163,7 @@ class WP_REST_Pattern_Directory_Controller extends WP_REST_Controller {
 
 		if ( $request->is_method( 'HEAD' ) ) {
 			// Return early as this handler doesn't add any response headers.
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 
 		$response = array();
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-post-types-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-post-types-controller.php
index 6ead90af59..0a66389346 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-post-types-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-post-types-controller.php
@@ -111,7 +111,7 @@ class WP_REST_Post_Types_Controller extends WP_REST_Controller {
 	public function get_items( $request ) {
 		if ( $request->is_method( 'HEAD' ) ) {
 			// Return early as this handler doesn't add any response headers.
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 
 		$data  = array();
@@ -186,7 +186,7 @@ class WP_REST_Post_Types_Controller extends WP_REST_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-post-types-controller.php */
-			return apply_filters( 'rest_prepare_post_type', new WP_REST_Response(), $post_type, $request );
+			return apply_filters( 'rest_prepare_post_type', new WP_REST_Response( array() ), $post_type, $request );
 		}
 
 		$taxonomies = wp_list_filter( get_object_taxonomies( $post_type->name, 'objects' ), array( 'show_in_rest' => true ) );
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
index 37b7c6305a..c51915a974 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
@@ -499,7 +499,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			);
 		}
 
-		$response = $is_head_request ? new WP_REST_Response() : rest_ensure_response( $posts );
+		$response = $is_head_request ? new WP_REST_Response( array() ) : rest_ensure_response( $posts );
 
 		$response->header( 'X-WP-Total', (int) $total_posts );
 		$response->header( 'X-WP-TotalPages', (int) $max_pages );
@@ -1847,7 +1847,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
-			return apply_filters( "rest_prepare_{$this->post_type}", new WP_REST_Response(), $post, $request );
+			return apply_filters( "rest_prepare_{$this->post_type}", new WP_REST_Response( array() ), $post, $request );
 		}
 
 		$fields = $this->get_fields_for_response( $request );
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
index 2756e3d751..3b943044d2 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
@@ -355,7 +355,7 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 
 			$response = rest_ensure_response( $response );
 		} else {
-			$response = new WP_REST_Response();
+			$response = new WP_REST_Response( array() );
 		}
 
 		$response->header( 'X-WP-Total', (int) $total_revisions );
@@ -591,7 +591,7 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php */
-			return apply_filters( 'rest_prepare_revision', new WP_REST_Response(), $post, $request );
+			return apply_filters( 'rest_prepare_revision', new WP_REST_Response( array() ), $post, $request );
 		}
 
 		$fields = $this->get_fields_for_response( $request );
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-search-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-search-controller.php
index 345a200c67..1168580d41 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-search-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-search-controller.php
@@ -165,7 +165,7 @@ class WP_REST_Search_Controller extends WP_REST_Controller {
 			);
 		}
 
-		$response = $is_head_request ? new WP_REST_Response() : rest_ensure_response( $results );
+		$response = $is_head_request ? new WP_REST_Response( array() ) : rest_ensure_response( $results );
 		$response->header( 'X-WP-Total', $total );
 		$response->header( 'X-WP-TotalPages', $max_pages );
 
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php
index 95a24cf53e..aba1773884 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php
@@ -121,7 +121,7 @@ class WP_REST_Sidebars_Controller extends WP_REST_Controller {
 	public function get_items( $request ) {
 		if ( $request->is_method( 'HEAD' ) ) {
 			// Return early as this handler doesn't add any response headers.
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 
 		$this->retrieve_widgets();
@@ -329,7 +329,7 @@ class WP_REST_Sidebars_Controller extends WP_REST_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php */
-			return apply_filters( 'rest_prepare_sidebar', new WP_REST_Response(), $raw_sidebar, $request );
+			return apply_filters( 'rest_prepare_sidebar', new WP_REST_Response( array() ), $raw_sidebar, $request );
 		}
 
 		$id      = $raw_sidebar['id'];
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-taxonomies-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-taxonomies-controller.php
index b7492c8150..082067b23e 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-taxonomies-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-taxonomies-controller.php
@@ -115,7 +115,7 @@ class WP_REST_Taxonomies_Controller extends WP_REST_Controller {
 	public function get_items( $request ) {
 		if ( $request->is_method( 'HEAD' ) ) {
 			// Return early as this handler doesn't add any response headers.
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 
 		// Retrieve the list of registered collection query parameters.
@@ -217,7 +217,7 @@ class WP_REST_Taxonomies_Controller extends WP_REST_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-taxonomies-controller.php */
-			return apply_filters( 'rest_prepare_taxonomy', new WP_REST_Response(), $taxonomy, $request );
+			return apply_filters( 'rest_prepare_taxonomy', new WP_REST_Response( array() ), $taxonomy, $request );
 		}
 
 		$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php
index 45e0d59d5b..3f13968ae2 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php
@@ -271,7 +271,7 @@ class WP_REST_Templates_Controller extends WP_REST_Controller {
 	public function get_items( $request ) {
 		if ( $request->is_method( 'HEAD' ) ) {
 			// Return early as this handler doesn't add any response headers.
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 
 		$query = array();
@@ -675,7 +675,7 @@ class WP_REST_Templates_Controller extends WP_REST_Controller {
 	public function prepare_item_for_response( $item, $request ) {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 
 		/*
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
index d927ba5e04..72632fa96a 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
@@ -370,7 +370,7 @@ class WP_REST_Terms_Controller extends WP_REST_Controller {
 			}
 		}
 
-		$response = $is_head_request ? new WP_REST_Response() : rest_ensure_response( $response );
+		$response = $is_head_request ? new WP_REST_Response( array() ) : rest_ensure_response( $response );
 
 		// Store pagination values for headers.
 		$per_page = (int) $prepared_args['number'];
@@ -899,7 +899,7 @@ class WP_REST_Terms_Controller extends WP_REST_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php */
-			return apply_filters( "rest_prepare_{$this->taxonomy}", new WP_REST_Response(), $item, $request );
+			return apply_filters( "rest_prepare_{$this->taxonomy}", new WP_REST_Response( array() ), $item, $request );
 		}
 
 		$fields = $this->get_fields_for_response( $request );
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php
index 3995bd1816..78e1b38b1b 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php
@@ -384,7 +384,7 @@ class WP_REST_Users_Controller extends WP_REST_Controller {
 			}
 		}
 
-		$response = $is_head_request ? new WP_REST_Response() : rest_ensure_response( $users );
+		$response = $is_head_request ? new WP_REST_Response( array() ) : rest_ensure_response( $users );
 
 		// Store pagination values for headers then unset for count query.
 		$per_page = (int) $prepared_args['number'];
@@ -1032,7 +1032,7 @@ class WP_REST_Users_Controller extends WP_REST_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php */
-			return apply_filters( 'rest_prepare_user', new WP_REST_Response(), $user, $request );
+			return apply_filters( 'rest_prepare_user', new WP_REST_Response( array() ), $user, $request );
 		}
 
 		$fields = $this->get_fields_for_response( $request );
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-widget-types-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-widget-types-controller.php
index cd0aef0c87..1eb1ef27eb 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-widget-types-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-widget-types-controller.php
@@ -147,7 +147,7 @@ class WP_REST_Widget_Types_Controller extends WP_REST_Controller {
 	public function get_items( $request ) {
 		if ( $request->is_method( 'HEAD' ) ) {
 			// Return early as this handler doesn't add any response headers.
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 
 		$data = array();
@@ -306,7 +306,7 @@ class WP_REST_Widget_Types_Controller extends WP_REST_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-widget-types-controller.php */
-			return apply_filters( 'rest_prepare_widget_type', new WP_REST_Response(), $widget_type, $request );
+			return apply_filters( 'rest_prepare_widget_type', new WP_REST_Response( array() ), $widget_type, $request );
 		}
 
 		$fields = $this->get_fields_for_response( $request );
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php
index 2a154693a1..52a42258ed 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php
@@ -138,7 +138,7 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 	public function get_items( $request ) {
 		if ( $request->is_method( 'HEAD' ) ) {
 			// Return early as this handler doesn't add any response headers.
-			return new WP_REST_Response();
+			return new WP_REST_Response( array() );
 		}
 
 		$this->retrieve_widgets();
@@ -686,7 +686,7 @@ class WP_REST_Widgets_Controller extends WP_REST_Controller {
 		// Don't prepare the response body for HEAD requests.
 		if ( $request->is_method( 'HEAD' ) ) {
 			/** This filter is documented in wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php */
-			return apply_filters( 'rest_prepare_widget', new WP_REST_Response(), $widget, $request );
+			return apply_filters( 'rest_prepare_widget', new WP_REST_Response( array() ), $widget, $request );
 		}
 
 		$parsed_id = wp_parse_widget_id( $widget_id );
diff --git a/tests/phpunit/tests/fonts/font-library/wpRestFontCollectionsController.php b/tests/phpunit/tests/fonts/font-library/wpRestFontCollectionsController.php
index 6f95def922..5bad543547 100644
--- a/tests/phpunit/tests/fonts/font-library/wpRestFontCollectionsController.php
+++ b/tests/phpunit/tests/fonts/font-library/wpRestFontCollectionsController.php
@@ -108,7 +108,7 @@ class Tests_REST_WpRestFontCollectionsController extends WP_Test_REST_Controller
 			return null;
 		}
 
-		$this->assertNull( $content, 'The response should be empty.' );
+		$this->assertSame( array(), $content, 'The response should be empty.' );
 		$headers = $response->get_headers();
 		$this->assertArrayHasKey( 'X-WP-Total', $headers, 'The "X-WP-Total" header should be present in the response.' );
 		// Includes non-valid collections.
@@ -172,7 +172,7 @@ class Tests_REST_WpRestFontCollectionsController extends WP_Test_REST_Controller
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/rest-autosaves-controller.php b/tests/phpunit/tests/rest-api/rest-autosaves-controller.php
index d452d6d126..7815f8ced2 100644
--- a/tests/phpunit/tests/rest-api/rest-autosaves-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-autosaves-controller.php
@@ -196,7 +196,7 @@ class WP_Test_REST_Autosaves_Controller extends WP_Test_REST_Post_Type_Controlle
 		$this->assertNotWPError( $response );
 		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
 		$this->assertSame( 0, $filter->get_call_count(), 'The "' . $hook_name . '" filter was called when it should not be for HEAD requests.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -314,7 +314,7 @@ class WP_Test_REST_Autosaves_Controller extends WP_Test_REST_Post_Type_Controlle
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	public function test_get_item_embed_context() {
@@ -889,4 +889,35 @@ class WP_Test_REST_Autosaves_Controller extends WP_Test_REST_Post_Type_Controlle
 		$this->assertSame( 200, $response->get_status() );
 		$this->assertSame( $autosave['id'], $data['id'], 'Original autosave was not returned' );
 	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		wp_set_current_user( self::$editor_id );
+		$request = new WP_REST_Request( 'HEAD', sprintf( $path, self::$post_id, self::$autosave_post_id ) );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/posts/%d/autosaves/%d' ),
+			'get_items request' => array( '/wp/v2/posts/%d' ),
+		);
+	}
 }
diff --git a/tests/phpunit/tests/rest-api/rest-block-type-controller.php b/tests/phpunit/tests/rest-api/rest-block-type-controller.php
index e0b0de91d0..7ba693286c 100644
--- a/tests/phpunit/tests/rest-api/rest-block-type-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-block-type-controller.php
@@ -636,7 +636,7 @@ class REST_Block_Type_Controller_Test extends WP_Test_REST_Controller_Testcase {
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -659,7 +659,38 @@ class REST_Block_Type_Controller_Test extends WP_Test_REST_Controller_Testcase {
 		$request  = new WP_REST_Request( 'HEAD', '/wp/v2/block-types' );
 		$response = rest_get_server()->dispatch( $request );
 		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		wp_set_current_user( self::$admin_id );
+		$request = new WP_REST_Request( 'HEAD', $path );
+		$request->set_param( '_fields', 'title' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/block-types/fake/test' ),
+			'get_items request' => array( '/wp/v2/block-types' ),
+		);
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/rest-categories-controller.php b/tests/phpunit/tests/rest-api/rest-categories-controller.php
index ba921b999b..5d1f893d87 100644
--- a/tests/phpunit/tests/rest-api/rest-categories-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-categories-controller.php
@@ -1360,6 +1360,36 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		$request = new WP_REST_Request( 'HEAD', $path );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/categories/1' ),
+			'get_items request' => array( '/wp/v2/categories' ),
+		);
 	}
 }
diff --git a/tests/phpunit/tests/rest-api/rest-comments-controller.php b/tests/phpunit/tests/rest-api/rest-comments-controller.php
index 3de15cfa76..647d5df03d 100644
--- a/tests/phpunit/tests/rest-api/rest-comments-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-comments-controller.php
@@ -3567,6 +3567,36 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		$request = new WP_REST_Request( 'HEAD', sprintf( $path, self::$approved_id ) );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/comments/%d' ),
+			'get_items request' => array( '/wp/v2/comments' ),
+		);
 	}
 }
diff --git a/tests/phpunit/tests/rest-api/rest-global-styles-revisions-controller.php b/tests/phpunit/tests/rest-api/rest-global-styles-revisions-controller.php
index c57d16da5e..8f730d4c88 100644
--- a/tests/phpunit/tests/rest-api/rest-global-styles-revisions-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-global-styles-revisions-controller.php
@@ -336,7 +336,38 @@ class WP_REST_Global_Styles_Revisions_Controller_Test extends WP_Test_REST_Contr
 		$request  = new WP_REST_Request( 'HEAD', '/wp/v2/global-styles/' . self::$global_styles_id . '/revisions' );
 		$response = rest_get_server()->dispatch( $request );
 		$this->assertSame( 200, $response->get_status(), 'Response status is 200.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		wp_set_current_user( self::$admin_id );
+		$request = new WP_REST_Request( 'GET', sprintf( $path, self::$global_styles_id, $this->revision_1_id ) );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/global-styles/%d/revisions/%d' ),
+			'get_items request' => array( '/wp/v2/global-styles/%d/revisions' ),
+		);
 	}
 
 	/**
@@ -366,7 +397,7 @@ class WP_REST_Global_Styles_Revisions_Controller_Test extends WP_Test_REST_Contr
 		$request  = new WP_REST_Request( 'HEAD', '/wp/v2/global-styles/' . self::$global_styles_id . '/revisions/' . $this->revision_1_id );
 		$response = rest_get_server()->dispatch( $request );
 		$this->assertSame( 200, $response->get_status(), 'Response status is 200.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/rest-pattern-directory-controller.php b/tests/phpunit/tests/rest-api/rest-pattern-directory-controller.php
index 23a7931511..1eb3d4f587 100644
--- a/tests/phpunit/tests/rest-api/rest-pattern-directory-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-pattern-directory-controller.php
@@ -167,7 +167,24 @@ class WP_REST_Pattern_Directory_Controller_Test extends WP_Test_REST_Controller_
 		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
 
 		$this->assertSame( 0, $filter->get_call_count(), 'The "' . $hook_name . '" filter was called when it should not be for HEAD requests.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @ticket 56481
+	 */
+	public function test_get_items_head_request_with_specified_fields_returns_success_response() {
+		wp_set_current_user( self::$contributor_id );
+		self::mock_successful_response( 'browse-all', true );
+		$request = new WP_REST_Request( 'HEAD', '/wp/v2/pattern-directory/patterns' );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/rest-post-types-controller.php b/tests/phpunit/tests/rest-api/rest-post-types-controller.php
index 3b61e0d6a9..f230373ce2 100644
--- a/tests/phpunit/tests/rest-api/rest-post-types-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-post-types-controller.php
@@ -111,7 +111,37 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		$request = new WP_REST_Request( 'HEAD', $path );
+		$request->set_param( '_fields', 'slug' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/types/post' ),
+			'get_items request' => array( '/wp/v2/types' ),
+		);
 	}
 
 	/**
@@ -324,7 +354,7 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 		remove_filter( $hook_name, $callback );
 		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
 		$this->assertSame( 0, $filter->get_call_count(), 'The "' . $hook_name . '" filter was called when it should not be for HEAD requests.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	protected function check_post_type_obj( $context, $post_type_obj, $data, $links ) {
diff --git a/tests/phpunit/tests/rest-api/rest-posts-controller.php b/tests/phpunit/tests/rest-api/rest-posts-controller.php
index e26eb3350c..2af803a09c 100644
--- a/tests/phpunit/tests/rest-api/rest-posts-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-posts-controller.php
@@ -295,7 +295,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$headers = $response->get_headers();
 		$this->assertSame( 0, $filter->get_call_count(), 'The "' . $hook_name . '" filter was called when it should not be for HEAD requests.' );
 		$this->assertArrayHasKey( 'Link', $headers, 'The "Link" header should be present in the response.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -320,7 +320,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$response = rest_get_server()->dispatch( $request );
 
 		if ( $request->is_method( 'HEAD' ) ) {
-			$this->assertNull( $response->get_data(), 'Failed asserting that response data is null for HEAD request.' );
+			$this->assertSame( array(), $response->get_data(), 'Failed asserting that response data is null for HEAD request.' );
 		} else {
 			$this->assertSame( array(), $response->get_data(), 'Failed asserting that response data is an empty array for GET request.' );
 		}
@@ -351,7 +351,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			$this->assertCount( $total_posts, $response->get_data() );
 
 		} else {
-			$this->assertNull( $response->get_data(), 'Failed asserting that response data is null for HEAD request.' );
+			$this->assertSame( array(), $response->get_data(), 'Failed asserting that response data is null for HEAD request.' );
 			$headers = $response->get_headers();
 			$this->assertSame( $total_posts, $headers['X-WP-Total'] );
 		}
@@ -366,7 +366,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			$this->assertCount( 2, $data );
 			$this->assertSameSets( array( self::$editor_id, self::$author_id ), wp_list_pluck( $data, 'author' ) );
 		} else {
-			$this->assertNull( $data, 'Failed asserting that response data is null for HEAD request.' );
+			$this->assertSame( array(), $data, 'Failed asserting that response data is null for HEAD request.' );
 			$headers = $response->get_headers();
 			$this->assertSame( 2, $headers['X-WP-Total'], 'Failed asserting that X-WP-Total header is 2.' );
 		}
@@ -381,7 +381,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			$this->assertCount( 1, $data );
 			$this->assertSame( self::$editor_id, $data[0]['author'] );
 		} else {
-			$this->assertNull( $data, 'Failed asserting that response data is null for HEAD request.' );
+			$this->assertSame( array(), $data, 'Failed asserting that response data is null for HEAD request.' );
 			$headers = $response->get_headers();
 			$this->assertSame( 1, $headers['X-WP-Total'], 'Failed asserting that X-WP-Total header is 1.' );
 		}
@@ -407,7 +407,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		if ( $request->is_method( 'get' ) ) {
 			$this->assertCount( $total_posts, $response->get_data() );
 		} else {
-			$this->assertNull( $response->get_data(), 'Failed asserting that response data is null for HEAD request.' );
+			$this->assertSame( array(), $response->get_data(), 'Failed asserting that response data is null for HEAD request.' );
 			$headers = $response->get_headers();
 			$this->assertSame( $total_posts, $headers['X-WP-Total'], 'Failed asserting that the number of posts is correct.' );
 		}
@@ -424,7 +424,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			$this->assertNotEquals( self::$editor_id, $data[0]['author'] );
 			$this->assertNotEquals( self::$author_id, $data[0]['author'] );
 		} else {
-			$this->assertNull( $response->get_data(), 'Failed asserting that response data is null for HEAD request.' );
+			$this->assertSame( array(), $response->get_data(), 'Failed asserting that response data is null for HEAD request.' );
 			$headers = $response->get_headers();
 			$this->assertSame( $total_posts - 2, $headers['X-WP-Total'], 'Failed asserting that the number of posts is correct.' );
 		}
@@ -441,7 +441,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			$this->assertNotEquals( self::$editor_id, $data[0]['author'] );
 			$this->assertNotEquals( self::$editor_id, $data[1]['author'] );
 		} else {
-			$this->assertNull( $response->get_data(), 'Failed asserting that response data is null for HEAD request.' );
+			$this->assertSame( array(), $response->get_data(), 'Failed asserting that response data is null for HEAD request.' );
 			$headers = $response->get_headers();
 			$this->assertSame( $total_posts - 1, $headers['X-WP-Total'], 'Failed asserting that the number of posts is correct.' );
 		}
@@ -483,7 +483,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			$this->assertCount( 2, $data );
 			$this->assertSame( $id2, $data[0]['id'] );
 		} else {
-			$this->assertNull( $data, 'Failed asserting that response data is null for HEAD request.' );
+			$this->assertSame( array(), $data, 'Failed asserting that response data is null for HEAD request.' );
 			$headers = $response->get_headers();
 			$this->assertSame( 2, $headers['X-WP-Total'], 'Failed asserting that the number of posts is correct.' );
 		}
@@ -498,7 +498,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			$this->assertCount( 2, $data );
 			$this->assertSame( $id1, $data[0]['id'] );
 		} else {
-			$this->assertNull( $data, 'Failed asserting that response data is null for HEAD request.' );
+			$this->assertSame( array(), $data, 'Failed asserting that response data is null for HEAD request.' );
 			$headers = $response->get_headers();
 			$this->assertSame( 2, $headers['X-WP-Total'], 'Failed asserting that the number of posts is correct.' );
 		}
@@ -2193,7 +2193,37 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		$request = new WP_REST_Request( 'HEAD', sprintf( $path, self::$post_id ) );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/posts/%d' ),
+			'get_items request' => array( '/wp/v2/posts' ),
+		);
 	}
 
 	public function test_get_item_links() {
diff --git a/tests/phpunit/tests/rest-api/rest-revisions-controller.php b/tests/phpunit/tests/rest-api/rest-revisions-controller.php
index 8d1c7c540c..c0b7a94726 100644
--- a/tests/phpunit/tests/rest-api/rest-revisions-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-revisions-controller.php
@@ -182,7 +182,7 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 
 		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
 		$this->assertSame( 0, $filter->get_call_count(), 'The "' . $hook_name . '" filter was called when it should not be for HEAD requests.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -300,7 +300,39 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 		if ( 'GET' === $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		wp_set_current_user( self::$editor_id );
+		$request = new WP_REST_Request( 'HEAD', sprintf( $path, self::$post_id, $this->revision_id1 ) );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+
+			'get_item request'  => array( '/wp/v2/posts/%d/revisions/%d' ),
+			'get_items request' => array( '/wp/v2/posts/%d/revisions' ),
+		);
 	}
 
 	public function test_get_item_embed_context() {
diff --git a/tests/phpunit/tests/rest-api/rest-sidebars-controller.php b/tests/phpunit/tests/rest-api/rest-sidebars-controller.php
index 1c6249da9e..dd01d4f2de 100644
--- a/tests/phpunit/tests/rest-api/rest-sidebars-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-sidebars-controller.php
@@ -171,7 +171,7 @@ class WP_Test_REST_Sidebars_Controller extends WP_Test_REST_Controller_Testcase
 
 		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
 		$this->assertSame( 0, $filter->get_call_count(), 'The "' . $hook_name . '" filter was called when it should not be for HEAD requests.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -567,7 +567,46 @@ class WP_Test_REST_Sidebars_Controller extends WP_Test_REST_Controller_Testcase
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		$this->setup_sidebar(
+			'sidebar-1',
+			array(
+				'name' => 'Test sidebar',
+			)
+		);
+
+		$request = new WP_REST_Request( 'HEAD', $path );
+		// This endpoint doesn't seem to support _fields param, but we need to set it to reproduce the fatal error.
+		$request->set_param( '_fields', 'name' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+
+			'get_item request'  => array( '/wp/v2/sidebars/sidebar-1' ),
+			'get_items request' => array( '/wp/v2/sidebars' ),
+		);
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/rest-tags-controller.php b/tests/phpunit/tests/rest-api/rest-tags-controller.php
index bf09be0615..3b23135c93 100644
--- a/tests/phpunit/tests/rest-api/rest-tags-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-tags-controller.php
@@ -1614,6 +1614,37 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		$tag_id  = self::factory()->tag->create();
+		$request = new WP_REST_Request( 'HEAD', sprintf( $path, $tag_id ) );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/tags/%d' ),
+			'get_items request' => array( '/wp/v2/tags' ),
+		);
 	}
 }
diff --git a/tests/phpunit/tests/rest-api/rest-taxonomies-controller.php b/tests/phpunit/tests/rest-api/rest-taxonomies-controller.php
index 9ff0450af9..4d8a57d560 100644
--- a/tests/phpunit/tests/rest-api/rest-taxonomies-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-taxonomies-controller.php
@@ -73,7 +73,7 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 		remove_filter( $hook_name, $callback );
 		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
 		$this->assertSame( 0, $filter->get_call_count(), 'The "' . $hook_name . '" filter was called when it should not be for HEAD requests.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	public function test_get_items_context_edit() {
@@ -185,7 +185,37 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		$request = new WP_REST_Request( 'HEAD', $path );
+		$request->set_param( '_fields', 'name' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/taxonomies/category' ),
+			'get_items request' => array( '/wp/v2/taxonomies' ),
+		);
 	}
 
 	public function test_get_item_edit_context() {
diff --git a/tests/phpunit/tests/rest-api/rest-users-controller.php b/tests/phpunit/tests/rest-api/rest-users-controller.php
index 1219a0c8a2..5542c12d7d 100644
--- a/tests/phpunit/tests/rest-api/rest-users-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-users-controller.php
@@ -254,7 +254,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 
 		if ( 'HEAD' === $method ) {
-			$this->assertNull( $response->get_data(), 'Expected null response data for HEAD request, but received non-null data.' );
+			$this->assertSame( array(), $response->get_data(), 'Expected null response data for HEAD request, but received non-null data.' );
 			return null;
 		}
 
@@ -3251,7 +3251,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -3272,7 +3272,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$this->assertSame( 200, $response->get_status() );
 		if ( $is_head_request ) {
-			$this->assertNull( $response->get_data() );
+			$this->assertSame( array(), $response->get_data() );
 		} else {
 			$this->assertNotEmpty( $response->get_data() );
 		}
@@ -3306,6 +3306,39 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$this->assertMatchesRegularExpression( $pattern, $query->request, 'The SQL query does not match the expected string.' );
 	}
 
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		$user_id = self::factory()->user->create();
+		wp_set_current_user( self::$user );
+
+		$request = new WP_REST_Request( 'HEAD', sprintf( $path, $user_id ) );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/users/%d' ),
+			'get_items request' => array( '/wp/v2/users' ),
+		);
+	}
+
 	protected function check_user_data( $user, $data, $context, $links ) {
 		$this->assertSame( $user->ID, $data['id'] );
 		$this->assertSame( $user->display_name, $data['name'] );
diff --git a/tests/phpunit/tests/rest-api/rest-widget-types-controller.php b/tests/phpunit/tests/rest-api/rest-widget-types-controller.php
index bf7c1a3d7a..3003c2e974 100644
--- a/tests/phpunit/tests/rest-api/rest-widget-types-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-widget-types-controller.php
@@ -129,7 +129,7 @@ class WP_Test_REST_Widget_Types_Controller extends WP_Test_REST_Controller_Testc
 		$request  = new WP_REST_Request( 'HEAD', '/wp/v2/widget-types' );
 		$response = rest_get_server()->dispatch( $request );
 		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -227,7 +227,7 @@ class WP_Test_REST_Widget_Types_Controller extends WP_Test_REST_Controller_Testc
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -242,6 +242,37 @@ class WP_Test_REST_Widget_Types_Controller extends WP_Test_REST_Controller_Testc
 		);
 	}
 
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		wp_set_current_user( self::$admin_id );
+		$request = new WP_REST_Request( 'HEAD', $path );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/widget-types/calendar' ),
+			'get_items request' => array( '/wp/v2/widget-types' ),
+		);
+	}
+
 	/**
 	 * @ticket 41683
 	 */
diff --git a/tests/phpunit/tests/rest-api/rest-widgets-controller.php b/tests/phpunit/tests/rest-api/rest-widgets-controller.php
index 02b63da6d8..246ad3b61e 100644
--- a/tests/phpunit/tests/rest-api/rest-widgets-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-widgets-controller.php
@@ -472,7 +472,7 @@ class WP_Test_REST_Widgets_Controller extends WP_Test_REST_Controller_Testcase {
 		$this->assertNotWPError( $response );
 		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
 		$this->assertSame( 0, $filter->get_call_count(), 'The "' . $hook_name . '" filter was called when it should not be for HEAD requests.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	public function mocked_rss_response() {
@@ -644,7 +644,68 @@ class WP_Test_REST_Widgets_Controller extends WP_Test_REST_Controller_Testcase {
 		if ( 'HEAD' !== $method ) {
 			return null;
 		}
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		add_filter( 'pre_http_request', array( $this, 'mocked_rss_response' ) );
+		global $wp_widget_factory;
+
+		$wp_widget_factory->widgets['WP_Widget_RSS']->widget_options['show_instance_in_rest'] = false;
+
+		$block_content = '<!-- wp:paragraph --><p>Block test</p><!-- /wp:paragraph -->';
+
+		$this->setup_widget(
+			'rss',
+			1,
+			array(
+				'title' => 'RSS test',
+				'url'   => 'https://wordpress.org/news/feed',
+			)
+		);
+		$this->setup_widget(
+			'block',
+			1,
+			array(
+				'content' => $block_content,
+			)
+		);
+		$this->setup_sidebar(
+			'sidebar-1',
+			array(
+				'name' => 'Test sidebar',
+			),
+			array( 'block-1', 'rss-1', 'testwidget' )
+		);
+
+		$request = new WP_REST_Request( 'HEAD', $path );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+		remove_filter( 'pre_http_request', array( $this, 'mocked_rss_response' ) );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/widgets/block-1' ),
+			'get_items request' => array( '/wp/v2/widgets' ),
+		);
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/wpRestBlockPatternCategoriesController.php b/tests/phpunit/tests/rest-api/wpRestBlockPatternCategoriesController.php
index 58352a0a62..bae0bbb88a 100644
--- a/tests/phpunit/tests/rest-api/wpRestBlockPatternCategoriesController.php
+++ b/tests/phpunit/tests/rest-api/wpRestBlockPatternCategoriesController.php
@@ -131,7 +131,25 @@ class Tests_REST_WpRestBlockPatternCategoriesController extends WP_Test_REST_Con
 		$request  = new WP_REST_Request( 'HEAD', static::REQUEST_ROUTE );
 		$response = rest_get_server()->dispatch( $request );
 		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response() {
+		wp_set_current_user( self::$admin_id );
+		$request = new WP_REST_Request( 'HEAD', static::REQUEST_ROUTE );
+		$request->set_param( '_fields', 'name' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/wpRestTemplateAutosavesController.php b/tests/phpunit/tests/rest-api/wpRestTemplateAutosavesController.php
index d5e9213517..d3cbf91260 100644
--- a/tests/phpunit/tests/rest-api/wpRestTemplateAutosavesController.php
+++ b/tests/phpunit/tests/rest-api/wpRestTemplateAutosavesController.php
@@ -316,7 +316,7 @@ class Tests_REST_wpRestTemplateAutosavesController extends WP_Test_REST_Controll
 		);
 		$response = rest_get_server()->dispatch( $request );
 		$this->assertSame( 200, $response->get_status(), 'Response status is 200.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -470,7 +470,7 @@ class Tests_REST_wpRestTemplateAutosavesController extends WP_Test_REST_Controll
 		$request  = new WP_REST_Request( 'HEAD', '/wp/v2/templates/' . self::TEST_THEME . '/' . self::TEMPLATE_NAME . '/autosaves/' . $autosave_post_id );
 		$response = rest_get_server()->dispatch( $request );
 		$this->assertSame( 200, $response->get_status(), 'Response status is 200.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -485,6 +485,79 @@ class Tests_REST_wpRestTemplateAutosavesController extends WP_Test_REST_Controll
 		);
 	}
 
+	/**
+	 * @dataProvider data_get_item_with_data_provider
+	 * @covers       WP_REST_Template_Autosaves_Controller::get_item
+	 * @ticket 56922
+	 *
+	 * @param string $parent_post_property_name A class property name that contains the parent post object.
+	 * @param string $rest_base Base part of the REST API endpoint to test.
+	 * @param string $template_id Template ID to use in the test.
+	 */
+	public function test_get_item_head_request_with_specified_fields_returns_success_response( $parent_post_property_name, $rest_base, $template_id ) {
+		wp_set_current_user( self::$admin_id );
+
+		$parent_post = self::$$parent_post_property_name;
+
+		$autosave_post_id = wp_create_post_autosave(
+			array(
+				'post_content' => 'Autosave content.',
+				'post_ID'      => $parent_post->ID,
+				'post_type'    => $parent_post->post_type,
+			)
+		);
+
+		$request = new WP_REST_Request(
+			'HEAD',
+			'/wp/v2/' . $rest_base . '/' . $template_id . '/autosaves/' . $autosave_post_id
+		);
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * @dataProvider data_get_items_with_data_provider
+	 * @covers       WP_REST_Template_Autosaves_Controller::get_items
+	 * @ticket 56922
+	 *
+	 * @param string $parent_post_property_name A class property name that contains the parent post object.
+	 * @param string $rest_base Base part of the REST API endpoint to test.
+	 * @param string $template_id Template ID to use in the test.
+	 */
+	public function test_get_items_head_request_with_specified_fields_returns_success_response( $parent_post_property_name, $rest_base, $template_id ) {
+		wp_set_current_user( self::$admin_id );
+		// Cannot access this property in the data provider because it is not initialized at the time of execution.
+		$parent_post = self::$$parent_post_property_name;
+		wp_create_post_autosave(
+			array(
+				'post_content' => 'Autosave content.',
+				'post_ID'      => $parent_post->ID,
+				'post_type'    => $parent_post->post_type,
+			)
+		);
+
+		$request = new WP_REST_Request(
+			'HEAD',
+			'/wp/v2/' . $rest_base . '/' . $template_id . '/autosaves'
+		);
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
 	/**
 	 * @coversNothing
 	 * @ticket 56922
diff --git a/tests/phpunit/tests/rest-api/wpRestTemplateRevisionsController.php b/tests/phpunit/tests/rest-api/wpRestTemplateRevisionsController.php
index 700d31360c..86b29c12bf 100644
--- a/tests/phpunit/tests/rest-api/wpRestTemplateRevisionsController.php
+++ b/tests/phpunit/tests/rest-api/wpRestTemplateRevisionsController.php
@@ -437,7 +437,7 @@ class Tests_REST_wpRestTemplateRevisionsController extends WP_Test_REST_Controll
 		);
 		$response = rest_get_server()->dispatch( $request );
 		$this->assertSame( 200, $response->get_status(), 'Response status is 200.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -627,7 +627,7 @@ class Tests_REST_wpRestTemplateRevisionsController extends WP_Test_REST_Controll
 		$request     = new WP_REST_Request( 'HEAD', '/wp/v2/templates/' . self::TEST_THEME . '/' . self::TEMPLATE_NAME . '/revisions/' . $revision_id );
 		$response    = rest_get_server()->dispatch( $request );
 		$this->assertSame( 200, $response->get_status(), 'Response status is 200.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**
@@ -642,6 +642,65 @@ class Tests_REST_wpRestTemplateRevisionsController extends WP_Test_REST_Controll
 		);
 	}
 
+	/**
+	 * @dataProvider data_get_item_with_data_provider
+	 * @covers       WP_REST_Template_Revisions_Controller::get_item
+	 * @ticket 56922
+	 *
+	 * @param string $parent_post_property_name A class property name that contains the parent post object.
+	 * @param string $rest_base Base part of the REST API endpoint to test.
+	 * @param string $template_id Template ID to use in the test.
+	 */
+	public function test_get_item_head_request_with_specified_fields_returns_success_response( $parent_post_property_name, $rest_base, $template_id ) {
+		wp_set_current_user( self::$admin_id );
+
+		$parent_post = self::$$parent_post_property_name;
+
+		$revisions   = wp_get_post_revisions( $parent_post, array( 'fields' => 'ids' ) );
+		$revision_id = array_shift( $revisions );
+
+		$request = new WP_REST_Request(
+			'HEAD',
+			'/wp/v2/' . $rest_base . '/' . $template_id . '/revisions/' . $revision_id
+		);
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * @dataProvider data_get_items_with_data_provider
+	 * @covers       WP_REST_Template_Revisions_Controller::get_items
+	 * @ticket 56922
+	 *
+	 * @param string $parent_post_property_name A class property name that contains the parent post object.
+	 * @param string $rest_base Base part of the REST API endpoint to test.
+	 * @param string $template_id Template ID to use in the test.
+	 */
+	public function test_get_items_head_request_with_specified_fields_returns_success_response( $parent_post_property_name, $rest_base, $template_id ) {
+		wp_set_current_user( self::$admin_id );
+		$parent_post = self::$$parent_post_property_name;
+
+		$request = new WP_REST_Request(
+			'HEAD',
+			'/wp/v2/' . $rest_base . '/' . $template_id . '/revisions'
+		);
+
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
 	/**
 	 * @dataProvider data_get_item_not_found
 	 * @covers WP_REST_Template_Revisions_Controller::get_item
diff --git a/tests/phpunit/tests/rest-api/wpRestTemplatesController.php b/tests/phpunit/tests/rest-api/wpRestTemplatesController.php
index 8ffa8b4e79..b10b8b68ab 100644
--- a/tests/phpunit/tests/rest-api/wpRestTemplatesController.php
+++ b/tests/phpunit/tests/rest-api/wpRestTemplatesController.php
@@ -185,7 +185,38 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 		$request  = new WP_REST_Request( 'HEAD', '/wp/v2/templates' );
 		$response = rest_get_server()->dispatch( $request );
 		$this->assertSame( 200, $response->get_status(), 'Response status is 200.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+	}
+
+	/**
+	 * @dataProvider data_head_request_with_specified_fields_returns_success_response
+	 * @ticket 56481
+	 *
+	 * @param string $path The path to test.
+	 */
+	public function test_head_request_with_specified_fields_returns_success_response( $path ) {
+		wp_set_current_user( self::$admin_id );
+		$request = new WP_REST_Request( 'HEAD', $path );
+		$request->set_param( '_fields', 'id' );
+		$server   = rest_get_server();
+		$response = $server->dispatch( $request );
+		add_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10, 3 );
+		$response = apply_filters( 'rest_post_dispatch', $response, $server, $request );
+		remove_filter( 'rest_post_dispatch', 'rest_filter_response_fields', 10 );
+
+		$this->assertSame( 200, $response->get_status(), 'The response status should be 200.' );
+	}
+
+	/**
+	 * Data provider intended to provide paths for testing HEAD requests.
+	 *
+	 * @return array
+	 */
+	public static function data_head_request_with_specified_fields_returns_success_response() {
+		return array(
+			'get_item request'  => array( '/wp/v2/templates/default//my_template' ),
+			'get_items request' => array( '/wp/v2/templates' ),
+		);
 	}
 
 	/**
@@ -291,7 +322,7 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 		$request  = new WP_REST_Request( 'HEAD', '/wp/v2/templates/default//my_template' );
 		$response = rest_get_server()->dispatch( $request );
 		$this->assertSame( 200, $response->get_status(), 'Response status is 200.' );
-		$this->assertNull( $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
+		$this->assertSame( array(), $response->get_data(), 'The server should not generate a body in response to a HEAD request.' );
 	}
 
 	/**