DataSnap REST服务器 - 启用HTTP KeepAlive

I'm using Delphi XE2 to build a DataSnap HTTP REST server to run as a service on Windows 2008. I read somewhere that by default the HTTP 'KeepAlive' is disabled for DataSnap server projects, if so can somebody help as to how to enable this. Thanks. I'm using Delphi XE2 to build a DataSnap HTTP R