// RFC 7540, sec 8.1.2.6: A request or response is also malformed if the
		// value of a content-length header field does not equal the sum of the
		// DATA frame payload lengths that form the body.
		return sc.countError("send_too_much", http2streamError(id, http2ErrCodeProtocol))
	}
	if f.Length > 0 {
		// Check whether the client has flow control quota.
		if !http2takeInflows(&sc.inflow, &st.inflow, f.Length) {