diff --git a/wp-comments-post.php b/wp-comments-post.php
index 4e9f1fcfb0..2c421d327a 100644
--- a/wp-comments-post.php
+++ b/wp-comments-post.php
@@ -6,8 +6,13 @@
  */
 
 if ( 'POST' != $_SERVER['REQUEST_METHOD'] ) {
+	$protocol = $_SERVER['SERVER_PROTOCOL'];
+	if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0' ) ) ) {
+		$protocol = 'HTTP/1.0';
+	}
+
 	header('Allow: POST');
-	header('HTTP/1.1 405 Method Not Allowed');
+	header("$protocol 405 Method Not Allowed");
 	header('Content-Type: text/plain');
 	exit;
 }
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 8c0f96cf54..bd5a8ac3da 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-alpha-38431';
+$wp_version = '4.7-alpha-38432';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.