anchor.diff:        no_call
     end.
   
  -send(Req, State, Data, Next) ->
  +send(Req, State = #state{res_chunked = true}, Data, Next) ->
     case cowboy_req:chunk(Data, Req) of
       ok ->
         next(Req, State, Next);
  
positive.code:       terminate(Req, State);
      {error, Reason} ->
        error_terminate(Req, State, error, Reason, send, 4)
    end.
  
  exported(_Req, _State = #state{handler = Handler}, Callback, Arity) ->
    erlang:function_exported(Handler, Callback, Arity).
  
negative.code: filter_headers([{<<"content-length">>, _}|Headers], Acc) ->
    filter_headers(Headers, Acc);
  filter_headers([{<<"date">>, _}|Headers], Acc) ->
    filter_headers(Headers, Acc);
  filter_headers([{<<"transfer-encoding">>, _}|Headers], Acc) ->
    filter_headers(Headers, Acc);
  filter_headers([Header|Headers], Acc) ->
    filter_headers(Headers, [Header|Acc]).
  