[Web] Fix Autodiscover issue with Outlook 2019, fixes #2300

data/web/autodiscover-json.php

@@ -8,10 +8,10 @@ if(file_exists('inc/vars.local.inc.php')) {
 $autodiscover_config = array_merge($default_autodiscover_config, $autodiscover_config);
 
 header('Content-type: application/json');
-if ($_GET['Protocol'] == 'ActiveSync') {
+if (strtolower($_GET['Protocol']) == 'activesync') {
   echo '{"Protocol":"ActiveSync","Url":"' . $autodiscover_config['activesync']['url'] . '"}';
 }
-elseif ($_GET['Protocol'] == 'AutodiscoverV1') {
+elseif (strtolower($_GET['Protocol']) == 'autodiscoverv1') {
   echo '{"Protocol":"AutodiscoverV1","Url":"https://' . $_SERVER['HTTP_HOST'] . '/Autodiscover/Autodiscover.xml"}';
 }
 else {