anchor.diff:    Url = make_request_url(Params, substitute(extract(Url0), SubVars)),
     Req#request{ url  = Url
                , headers = Hdrs
  -             , body = RawBody
  +             , body = from_utf8(RawBody)
                }.
   
   make_response(#response{headers=Hdrs, body=RawBody0} = Rsp, SubVars) ->
  
positive.code: 
  http_request(R = #request{}) ->
    Body = case R#request.body of
      undefined -> <<>>;
      Bin       -> Bin
    end,
    lhttpc:request( R#request.url
                  , R#request.method
  
negative.code:   Rsp#response{ body = maybe_parse_body(Hdrs, RawBody)
                }.
  
  maybe_parse_body(_Hdrs, null) ->
    [];
  maybe_parse_body(Hdrs, Body) ->
    case is_json_body(Hdrs, Body) of
      true  -> parse_json(Body);
  