ZO-39 Add capabilities and gab-folder headers.

src/lib/request/settings.php

@@ -55,6 +55,14 @@ class Settings extends RequestProcessor {
         if (!self::$decoder->getElementStartTag(SYNC_SETTINGS_SETTINGS))
             return false;
 
+        // add capability header for OL client
+        if(self::$deviceManager->IsOutlookClient()) {
+            self::$specialHeaders = array();
+            // TODO these values need to be configurable, ZO-41
+            self::$specialHeaders[] = "X-Push-Capabilities: gab,receiveflags,sendflags,oof,recover";
+            self::$specialHeaders[] = "X-Push-GAB-Name: Z-Push-OL-GAB-Acacia";
+        }
+
         //save the request parameters
         $request = array();