Headers in HttpRequest

Hi Guys,

I'm using Ensemble 2014 and have a code that Posts HttpRequest to a REST API and working fine, but don't know how to add Header to my request!?

I tried  Set Request.SetHeader("Source","Civicview") but it's bringing a Syntax error, any help pls?

Set Request= ##class(%Net.HttpRequest).%New()// D Body.%ToJSON()Set Request.Server = "devtest.altus.net.au"Set Request.Location = "/STP_IF/rest/Employee/CivicCreate"//S Request.ProxyAuthorization="SVRWSVMhME4yOlVyYW51czY="Set Request.ContentType = "application/json"Set Request.SetHeader("Source","Civicview")Set Request.SetHeader("PayDate","2017.01.11")

thanks