const net/http/internal/http2.cipher_TLS_ECDHE_ECDSA_WITH_AES_256_CCM

one use

	net/http/internal/http2 (current package)
		ciphers.go#L337: 	cipher_TLS_ECDHE_ECDSA_WITH_AES_256_CCM             uint16 = 0xC0AD