<?php $overriddenKeys = array_intersect_key($expectedGlobalVariables['$_SERVER'], $expectedCommonVariables);
$expectedCommonVariables = array_merge($expectedCommonVariables, $overriddenKeys);
self::assertArraySubset($expectedCommonVariables, $response['$_SERVER']);
$keysToRemove = array_keys(array_diff_key($expectedCommonVariables, $overriddenKeys));