Defining a New Dataflow - using a restful API endpoint

I am creating a new Dataflow with the data source connector template "Blank query".  I'm using blank query because it the only option that allows me to use a security token. 

The motivation for trying to build a dataflow is that we now have more than one report using the exact-same-datasource and transformations.

The raw query I'm about to show you works perfectly in a non-dataflow context and has been in operation for over a year. 

here is the query (sensitive keys/data replaced)

let
  actualUrl = "https://some-endpoint.com/api/",
  record = [token="SOME-SECRET-TOKEN-VALUE",
    content="record",
    format="csv"
    ],
  body = Text.ToBinary(Uri.BuildQueryString(record)),
  options = [Headers =[#"Content-type"="application/x-www-form-urlencoded"], Content=body],
  result = Web.Contents(actualUrl, options),
  #"Imported as CSV" = Csv.Document(result, [Delimiter = ",", Encoding = 65001, QuoteStyle = QuoteStyle.Csv]),
  #"Promoted Headers" = Table.PromoteHeaders(#"Imported as CSV", [PromoteAllScalars = true])
 in
  #"Promoted Headers"

 Unfortunatley I can't get the dataflow to skip the authentication part (which is possible when not using a dataflow)

Does anyone know if dataflows are even possible if the datasource is a webapi using a token in the header?