http://developers.de/blogs/damir_dobric/archive/2011/06/04/wcf-how-to-append-header-to-http-request.aspxLong time ago I have described how to inject the message header in WCF message by using of Operation Context. After some time I also have posted how to do the same thing in Silverlight. Now in the time of AppFabric and Access Control Service there isenCommunityServer 2008 SP1 (Build: 30619.63)