const net/http/internal/http2.cipher_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256

one use

	net/http/internal/http2 (current package)
		ciphers.go#L344: 	cipher_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 uint16 = 0xCCA9