-type error() ::
          no_error | protocol_error | internal_error | flow_control_error | settings_timeout |
          stream_closed | frame_size_error | refused_stream | cancel | compression_error |
          connect_error | enhance_your_calm | inadequate_security | http_1_1_required | unknown_error.

-type exclusive() :: exclusive | shared.

-type fin() :: fin | nofin.

-type frame() ::
          {data, streamid(), fin(), binary()} |
          {headers, streamid(), fin(), head_fin(), binary()} |
          {headers, streamid(), fin(), head_fin(), exclusive(), streamid(), weight(), binary()} |
          {priority, streamid(), exclusive(), streamid(), weight()} |
          {rst_stream, streamid(), error()} |
          {settings, settings()} |
          settings_ack |
          {push_promise, streamid(), head_fin(), streamid(), binary()} |
          {ping, integer()} |
          {ping_ack, integer()} |
          {goaway, streamid(), error(), binary()} |
          {window_update, non_neg_integer()} |
          {window_update, streamid(), non_neg_integer()} |
          {continuation, streamid(), head_fin(), binary()}.

-type head_fin() :: head_fin | head_nofin.

-type settings() :: map().

-type streamid() :: pos_integer().

-type weight() :: 1..256.