Set request header in integration test with Rails

I'm using session and I call it like this:

test_helper

  get_session()
   open_session
  end 

propertyController class

 current_session = get_session 
 current_session.get "/properties/"

I now need to figure out how to include an access token in the request header like request["header-name"] = token. I need this to be included in the open_session before it's returns. Is there a way to call request in an integration test without it being nul?