diff --git a/htdocs/caldav.php b/htdocs/caldav.php
index d63c0c1e..035def1d 100644
--- a/htdocs/caldav.php
+++ b/htdocs/caldav.php
@@ -12,6 +12,8 @@ require_once("../inc/always.php");
 dbg_error_log( "caldav", " User agent: %s", ((isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : "Unfortunately Mulberry and Chandler don't send a 'User-agent' header with their requests :-(")) );
 require_once("BasicAuthSession.php");
 
+dbg_log_array( "headers", '_SERVER', $_SERVER, true );
+
 require_once("CalDAVRequest.php");
 $request = new CalDAVRequest();