Make http hostname, protocol, and scheme available to services.

Refs: #7638

@@ -424,6 +424,10 @@ public class DirectControlServlet extends HttpServlet {
 
             Debug.logInfo("USERLOGIN " + context.get("userLogin") + " AUTHTOKEN " + authToken, module);
 
+            context.put("httpHostname", request.getHeader("Host"));
+            context.put("httpProtocol", request.getProtocol());
+            context.put("httpScheme", request.getScheme());
+
             DispatchContext dctx = dispatcher.getDispatchContext();
             ModelService model = dctx.getModelService(serviceName);