func (a *Args) Validate() error {
	req, err := http.NewRequest(http.MethodPost, a.URL.String(), bytes.NewReader([]byte("")))
	if err != nil {
		return err
	}

	req.Header.Set("Content-Type", "application/json")
	if a.AuthToken != "" {
		req.Header.Set("Authorization", a.AuthToken)
	}

	client := &http.Client{Transport: a.Transport}
	resp, err := client.Do(req)
	if err != nil {
		return err
	}

		} else {
			ctx, cancel = context.WithTimeout(ctx, timeout)
		}
	}
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
	if err != nil {
		return nil, cancel, "", err
	}
	applyHeaders(req.Header, header, "Accept",
		"User-Agent",
		"X-Prometheus-Scrape-Timeout-Seconds",
	)

	resp, err := s.http.Do(req)
	if err != nil {
		return nil, cancel, "", fmt.Errorf("error scraping %s: %v", url, err)

	EnvoyTextLogFormat = "[%START_TIME%] \"%REQ(:METHOD)% %REQ(X-ENVOY-ORIGINAL-PATH?:PATH)% " +
		"%PROTOCOL%\" %RESPONSE_CODE% %RESPONSE_FLAGS% " +
		"%RESPONSE_CODE_DETAILS% %CONNECTION_TERMINATION_DETAILS% " +
		"\"%UPSTREAM_TRANSPORT_FAILURE_REASON%\" %BYTES_RECEIVED% %BYTES_SENT% " +
		"%DURATION% %RESP(X-ENVOY-UPSTREAM-SERVICE-TIME)% \"%REQ(X-FORWARDED-FOR)%\" " +

// This cannot be used concurrently.
func (m *muxClient) roundtrip(h HandlerID, req []byte) ([]byte, error) {
	if m.init {
		return nil, errors.New("mux client already used")
	}
	m.init = true
	m.singleResp = true
	msg := message{
		Op:         OpRequest,
		MuxID:      m.MuxID,
		Handler:    h,
		Flags:      m.BaseFlags | FlagEOF,
		Payload:    req,
		DeadlineMS: uint32(m.deadline.Milliseconds()),
	}
	if m.subroute != nil {

	// In Sotw, we care about all services.
	var services []*model.Service
	if features.FilterGatewayClusterConfig && proxy.Type == model.Router {
		services = req.Push.GatewayServices(proxy)
	} else {
		services = proxy.SidecarScope.Services()
	}
	return configgen.buildClusters(proxy, req, services)
}

	handler1 := func(req *testRequest) (resp *testResponse, err *RemoteErr) {
		resp = h1.NewResponse()
		*resp = testResponse{
			OrgNum:    req.Num,
			OrgString: req.String,
			Embedded:  *req,
		}
		return resp, nil
	}
	// Return error
	h2 := NewSingleHandler[*testRequest, *testResponse](handlerTest2, newTestRequest, newTestResponse)

	if len(topologySelectorTerms) == 0 {
		// empty term list matches all objects
		return true
	}

	for _, req := range topologySelectorTerms {
		// nil or empty term selects no objects
		if len(req.MatchLabelExpressions) == 0 {
			continue
		}

		labelSelector, err := TopologySelectorRequirementsAsSelector(req.MatchLabelExpressions)
		if err != nil || !labelSelector.Matches(lbls) {
			continue
		}

		return true

	defer cancel()
	req, err := http.NewRequestWithContext(ctx, http.MethodPost,
		h.Endpoint(), bytes.NewReader(payload))
	if err != nil {
		return fmt.Errorf("invalid configuration for '%s'; %v", h.Endpoint(), err)
	}
	if payloadType != "" {
		req.Header.Set(xhttp.ContentType, payloadType)
	}
	req.Header.Set(xhttp.MinIOVersion, xhttp.GlobalMinIOVersion)

			defer PutByteBuffer(payload)
			return append(GetByteBuffer()[:0], payload...), nil
		}))
		errFatal(rpc.Register(remote, func(req *testRequest) (resp *testResponse, err *RemoteErr) {
			return &testResponse{
				OrgNum:    req.Num,
				OrgString: req.String,
				Embedded:  *req,
			}, nil
		}))
		errFatal(err)
	}
	const payloadSize = 512
	rng := rand.New(rand.NewSource(time.Now().UnixNano()))

func newMockTLSServer(t *testing.T) *mockTLSServer {
	server := &mockTLSServer{}

	handler := http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
		t.Logf("request: %+v", *req)
		switch req.URL.Path {
		default:
			t.Logf("The request contains path: %v", req.URL)
			resp.WriteHeader(http.StatusOK)
		}
	})

	server.httpServer = httptest.NewTLSServer(handler)