private void readSettingsFrame( ChannelHandlerContext ctx, ByteBuf payload, Http2FrameListener listener) throws Http2Exception { if (flags.ack()) { listener.onSettingsAckRead(ctx); } else { int numSettings = payloadLength / SETTING_ENTRY_LENGTH; Http2Settings settings = new Http2Settings(); for (int index = 0; index < numSettings; ++index) { char id = (char) payload.readUnsignedShort(); long value = payload.readUnsignedInt(); try { settings.put(id, Long.valueOf(value)); } catch (IllegalArgumentException e) { switch (id) { case SETTINGS_MAX_FRAME_SIZE: throw connectionError(FRAME_SIZE_ERROR, e, e.getMessage()); case SETTINGS_INITIAL_WINDOW_SIZE: throw connectionError(FLOW_CONTROL_ERROR, e, e.getMessage()); default: throw connectionError(PROTOCOL_ERROR, e, e.getMessage()); } } } listener.onSettingsRead(ctx, settings); } }