diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-includes/ms-files.php
--- a/wp/wp-includes/ms-files.php	Tue Jun 09 11:14:17 2015 +0000
+++ b/wp/wp-includes/ms-files.php	Mon Oct 14 17:39:30 2019 +0200
@@ -11,7 +11,7 @@
 define( 'SHORTINIT', true );
 require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
 
-if( !is_multisite() )
+if ( !is_multisite() )
 	die( 'Multisite support not enabled' );
 
 ms_file_constants();
@@ -30,10 +30,10 @@
 }
 
 $mime = wp_check_filetype( $file );
-if( false === $mime[ 'type' ] && function_exists( 'mime_content_type' ) )
+if ( false === $mime[ 'type' ] && function_exists( 'mime_content_type' ) )
 	$mime[ 'type' ] = mime_content_type( $file );
 
-if( $mime[ 'type' ] )
+if ( $mime[ 'type' ] )
 	$mimetype = $mime[ 'type' ];
 else
 	$mimetype = 'image/' . substr( $file, strrpos( $file, '.' ) + 1 );
@@ -60,7 +60,7 @@
 // Support for Conditional GET - use stripslashes to avoid formatting.php dependency
 $client_etag = isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) ? stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) : false;
 
-if( ! isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) )
+if ( ! isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) )
 	$_SERVER['HTTP_IF_MODIFIED_SINCE'] = false;
 
 $client_last_modified = trim( $_SERVER['HTTP_IF_MODIFIED_SINCE'] );
@@ -80,3 +80,4 @@
 
 // If we made it this far, just serve the file
 readfile( $file );
+flush();