const net/http.http2cipher_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256

one use

	net/http (current package)
		h2_bundle.go#L439: 	http2cipher_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 uint16 = 0xCCA9