http2errPseudoAfterRegular   = errors.New("pseudo header field after regular")
)

// inflowMinRefresh is the minimum number of bytes we'll send for a
// flow control window update.
const http2inflowMinRefresh = 4 << 10

// inflow accounts for an inbound flow control window.
// It tracks both the latest window sent to the peer (used for enforcement)
// and the accumulated unsent window.
type http2inflow struct {