diff --git a/src/Nuxeo/Client/Api/Constants.php b/src/Nuxeo/Client/Api/Constants.php
index <HASH>..<HASH> 100644
--- a/src/Nuxeo/Client/Api/Constants.php
+++ b/src/Nuxeo/Client/Api/Constants.php
@@ -40,5 +40,15 @@ class Constants {
   const ENTITY_TYPE_DOCUMENTS = 'documents';
 
   const ENTITY_TYPE_OPERATION = 'operation';
+  
+  const RANDOM_HEADER = 'NX_RD';
 
-}
\ No newline at end of file
+  const TOKEN_SEP = ':';
+
+  const TS_HEADER = 'NX_TS';
+
+  const TOKEN_HEADER = 'NX_TOKEN';
+
+  const USER_HEADER = 'NX_USER';  
+
+}
Add constants for PORTAL_AUTH