-spec data(cowboy_stream:streamid(), cowboy_stream:fin(), cowboy_req:resp_body(), State) ->
              {cowboy_stream:commands(), State}
              when State :: state().

-spec early_error(cowboy_stream:streamid(),
                  cowboy_stream:reason(),
                  cowboy_stream:partial_req(),
                  Resp,
                  cowboy:opts()) ->
                     Resp
                     when Resp :: cowboy_stream:resp_command().

-spec info(cowboy_stream:streamid(), any(), State) -> {cowboy_stream:commands(), State}
              when State :: state().

-spec init(cowboy_stream:streamid(), cowboy_req:req(), cowboy:opts()) ->
              {cowboy_stream:commands(), state()}.

-spec terminate(cowboy_stream:streamid(), cowboy_stream:reason(), state()) -> any().