Ticket #34837: 34837.1.diff

src/wp-includes/rest-api/class-wp-rest-server.php

@@ -780 +780 @@
                                 $callback  = $handler['callback'];
                                 $response = null;
 
-                                if ( empty( $handler['methods'][ $method ] ) ) {
+                                $checked_method = 'HEAD' === $method ? 'GET' : $method;
+                                if ( empty( $handler['methods'][ $checked_method ] ) ) {
                                         continue;
                                 }
 

tests/phpunit/tests/rest-api/rest-server.php

@@ -121 +121 @@
                 $this->assertEquals( array( 'foo' => 'bar' ), $request->get_params() );
         }
 
+        public function test_head_request_handled_by_get() {
+                register_rest_route( 'head-request', '/test', array(
+                        'methods'  => array( 'GET' ),
+                        'callback' => '__return_true',
+                ) );
+                $request = new WP_REST_Request( 'HEAD', '/head-request/test' );
+                $response = $this->server->dispatch( $request );
+                $this->assertEquals( 200, $response->get_status() );
+        }
+
         /**
          * Pass a capability which the user does not have, this should
          * result in a 403 error.