// Reject cipher suites from Appendix A.
// "This list includes those cipher suites that do not
// offer an ephemeral key exchange and those that are
// based on the TLS null, stream or block cipher type"
func http2isBadCipher(cipher uint16) bool {
	switch cipher {
	case http2cipher_TLS_NULL_WITH_NULL_NULL,
		http2cipher_TLS_RSA_WITH_NULL_MD5,
		http2cipher_TLS_RSA_WITH_NULL_SHA,
		http2cipher_TLS_RSA_EXPORT_WITH_RC4_40_MD5,