const net/http.http2cipher_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256

one use

	net/http (current package)
		h2_bundle.go#L438: 	http2cipher_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256   uint16 = 0xCCA8