I am trying to use the "Call Http Web Service" to find out who is the Manager of a workflow initiator by using information from AD. I have tried following reference that I can find in both TechNet forums and from general Google searches. I cannot make it work. I cannot even get output variables to write to the workflow history log.
The actual string that I am using for the URL is http://sp.mydomain.org/_api/SP.UserProfiles.PeopleManager/GetPropertiesFor(accountName=@v)?@v=[%Workflow Context:Initiator%] where I replace the domain name for my actual domain. Can anybody tell me what I am doing wrong?