Ticket #39687: 39687.diff

src/wp-includes/class-http.php

@@ -688 +688 @@
                         $value = trim( $value );
 
                         if ( isset( $newheaders[ $key ] ) ) {
-                                if ( ! is_array( $newheaders[ $key ] ) )
-                                        $newheaders[$key] = array( $newheaders[ $key ] );
-                                $newheaders[ $key ][] = $value;
+                                $newheaders[ $key ] .= ',' . $value;
                         } else {
                                 $newheaders[ $key ] = $value;
                         }