Ticket #27498: 27498.2.patch

src/wp-includes/canonical.php

@@ -39 +39 @@
 function redirect_canonical( $requested_url = null, $do_redirect = true ) {
         global $wp_rewrite, $is_IIS, $wp_query, $wpdb;
 
-        if ( isset( $_SERVER['REQUEST_METHOD'] ) && 'GET' !== $_SERVER['REQUEST_METHOD'] ) {
+        if ( isset( $_SERVER['REQUEST_METHOD'] ) && ! in_array( strtoupper( $_SERVER['REQUEST_METHOD'] ), array( 'GET', 'HEAD' ) ) ) {
                 return;
         }