expected: "example.com",
		},
		{
			desc:     "test domains with port",
			domains:  []string{"example.com", "example.com:8080"},
			expected: "example.com",
		},
		{
			desc:     "test domains with ipv4 addresses",
			domains:  []string{"example.com", "example.com:8080", "1.2.3.4", "1.2.3.4:8080"},
			expected: "example.com, 1.2.3.4",
		},
		{
			desc:     "test domains with ipv6 addresses",