[
        ("/items", None, 200, {"ads_id": None}),
        ("/items", {"ads_id": "ads_track"}, 200, {"ads_id": "ads_track"}),
        (
            "/items",
            {"ads_id": "ads_track", "session": "cookiesession"},
            200,
            {"ads_id": "ads_track"},
        ),
        ("/items", {"session": "cookiesession"}, 200, {"ads_id": None}),
    ],
)

    [
        ("/items", None, 200, {"ads_id": None}),
        ("/items", {"ads_id": "ads_track"}, 200, {"ads_id": "ads_track"}),
        (
            "/items",
            {"ads_id": "ads_track", "session": "cookiesession"},
            200,
            {"ads_id": "ads_track"},
        ),
        ("/items", {"session": "cookiesession"}, 200, {"ads_id": None}),
    ],
)

digraph { envoy -> sds [dir=both, label="SDS"] envoy -> xdsproxy [dir=both, label="ADS"] sds -> ca [label="CSR"] xdsproxy -> discovery [dir=both,label="ADS"] envoy [shape=hexagon, color=purple] subgraph cluster_istioagent { label = "Istio Agent" color="orange" sds xdsproxy } subgraph cluster_istiod { label = "Istiod" color="lightblue" ca discovery } }...

    [
        ("/items", None, 200, {"ads_id": None}),
        ("/items", {"ads_id": "ads_track"}, 200, {"ads_id": "ads_track"}),
        (
            "/items",
            {"ads_id": "ads_track", "session": "cookiesession"},
            200,
            {"ads_id": "ads_track"},
        ),
        ("/items", {"session": "cookiesession"}, 200, {"ads_id": None}),
    ],
)

    [
        ("/items", None, 200, {"ads_id": None}),
        ("/items", {"ads_id": "ads_track"}, 200, {"ads_id": "ads_track"}),
        (
            "/items",
            {"ads_id": "ads_track", "session": "cookiesession"},
            200,
            {"ads_id": "ads_track"},
        ),
        ("/items", {"session": "cookiesession"}, 200, {"ads_id": None}),
    ],
)

    [
        ("/items", None, 200, {"ads_id": None}),
        ("/items", {"ads_id": "ads_track"}, 200, {"ads_id": "ads_track"}),
        (
            "/items",
            {"ads_id": "ads_track", "session": "cookiesession"},
            200,
            {"ads_id": "ads_track"},
        ),
        ("/items", {"session": "cookiesession"}, 200, {"ads_id": None}),
    ],
)

	const getResponse = `{"name":"ads","description":"ads debugging","output_level":"info","stack_trace_level":"none","log_callers":false}`

	switch request.Method {
	case http.MethodGet:
		_, _ = writer.Write([]byte(getResponse))
	}
}

func setupHTTPServer() (*httptest.Server, *url.URL) {
	handler := http.NewServeMux()
	handler.HandleFunc("/scopej/ads", adsHandler)

	}
	clusters := make([]*cluster.Cluster, 0)
	for _, c := range clusterDump.DynamicActiveClusters {
		if c.Cluster != nil {
			clusterTyped := &cluster.Cluster{}
			// Support v2 or v3 in config dump. See ads.go:RequestedTypes for more info.
			c.Cluster.TypeUrl = v3.ClusterType
			err = c.Cluster.UnmarshalTo(clusterTyped)
			if err != nil {
				return nil, err
			}
			clusters = append(clusters, clusterTyped)
		}

	}
	routes := make([]*route.RouteConfiguration, 0)
	for _, r := range routeDump.DynamicRouteConfigs {
		if r.RouteConfig != nil {
			routeTyped := &route.RouteConfiguration{}
			// Support v2 or v3 in config dump. See ads.go:RequestedTypes for more info.
			r.RouteConfig.TypeUrl = v3.RouteType
			err = r.RouteConfig.UnmarshalTo(routeTyped)
			if err != nil {
				return nil, err
			}
			routes = append(routes, routeTyped)
		}

requests to the agent, causing the agent to submit a CSR to the configured CA (generally Istiod). For other configuration,
Envoy will send [ADS](https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/operations/dynamic_configuration#aggregated-xds-ads)
requests to the agent, which will be forwarded to the configured discovery server (general Istiod).

## CA Flow