fix(webservice) Do not send cookie header in API answer

issue #5810

webservice/html/jsonrpc.php

@@ -26,6 +26,9 @@
  * Then the url of the webservice will be the url of your FusionDirectory instance followed by /jsonrpc.php
  */
 
+ini_set('session.use_cookies', 0);
+ini_set('session.use_only_cookies', 1);
+
 function authenticateHeader($message = 'Authentication required')
 {
   header('WWW-Authenticate: Basic realm="FusionDirectory"');