doc.Servers = []*openapi3.Server{
		{URL: "https://www.example.com/api/v1"},
		{URL: "{scheme}://{d0}.{d1}.com/api/v1/", Variables: map[string]*openapi3.ServerVariable{
			"d0":     {Default: "www"},
			"d1":     {Default: "example", Enum: []string{"example"}},
			"scheme": {Default: "https", Enum: []string{"https", "http"}},
		}},
	}

	expect(r, http.MethodGet, "https://domain0.domain1.com/api/v1/hello", helloGET, map[string]string{
		"d0": "domain0",
		"d1": "domain1",
	})