return nil, http2ConnectionError(http2ErrCodeFrameSize)
	}
	f := &http2SettingsFrame{http2FrameHeader: fh, p: p}
	if v, ok := f.Value(http2SettingInitialWindowSize); ok && v > (1<<31)-1 {
		countError("frame_settings_window_size_too_big")
		// Values above the maximum flow control window size of 2^31 - 1 MUST
		// be treated as a connection error (Section 5.4.1) of type
		// FLOW_CONTROL_ERROR.