tests := [...]struct {
		trace, old *ClientTrace
		want       string
	}{
		0: {
			want: "T",
			trace: &ClientTrace{
				ConnectStart: connectStart('T'),
			},
		},
		1: {
			want: "TO",
			trace: &ClientTrace{
				ConnectStart: connectStart('T'),
			},
			old: &ClientTrace{ConnectStart: connectStart('O')},
		},
		2: {
			want:  "O",
			trace: &ClientTrace{},

)

// unique type to prevent assignment.
type clientEventContextKey struct{}

// ContextClientTrace returns the [ClientTrace] associated with the
// provided context. If none, it returns nil.
func ContextClientTrace(ctx context.Context) *ClientTrace {
	trace, _ := ctx.Value(clientEventContextKey{}).(*ClientTrace)
	return trace
}

// WithClientTrace returns a new context based on the provided parent

	return s
}

// Return a function which update the global stats related to tcp connections
func setupReqStatsUpdate(req *http.Request) (*http.Request, func()) {
	var dialStart, dialEnd int64

	trace := &httptrace.ClientTrace{
		ConnectStart: func(network, addr string) {
			atomic.StoreInt64(&dialStart, time.Now().UnixNano())
		},
		ConnectDone: func(network, addr string, err error) {
			if err == nil {

	textproto.MIMEHeader(h).Del(key)
}

// Write writes a header in wire format.
func (h Header) Write(w io.Writer) error {
	return h.write(w, nil)
}

func (h Header) write(w io.Writer, trace *httptrace.ClientTrace) error {
	return h.writeSubset(w, nil, trace)
}

// Clone returns a copy of h or nil if h is nil.
func (h Header) Clone() Header {
	if h == nil {
		return nil
	}

	// Find total number of values.

	}
	dt.roundTripCount++
	dt.t.Logf("RoundTrip %v: started", rt.roundTripID)
	dt.t.Cleanup(func() {
		rt.cancel()
		rt.finish()
	})
	go func() {
		ctx = httptrace.WithClientTrace(ctx, &httptrace.ClientTrace{
			GotConn: func(info httptrace.GotConnInfo) {
				rt.conn = info.Conn.(*transportDialTesterConn)
			},
		})
		req, _ := http.NewRequestWithContext(ctx, "POST", dt.cst.ts.URL, pr)

				c.Transport.(*Transport).DisableKeepAlives = tc.disableKeepAlives
				req, err := NewRequest("GET", ts.URL, nil)
				if err != nil {
					t.Fatal(err)
				}
				count := 0
				trace := &httptrace.ClientTrace{
					WroteHeaderField: func(key string, field []string) {
						if key != "Connection" {
							return
						}
						if httpguts.HeaderValuesContainsToken(field, "close") {
							count += 1
						}

// sends it to another server, proxying the response back to the
// client.
//
// 1xx responses are forwarded to the client if the underlying
// transport supports ClientTrace.Got1xxResponse.
type ReverseProxy struct {
	// Rewrite must be a function which modifies
	// the request into a new request to be sent
	// using Transport. Its response is then copied

	newServerRequest := func(tr *panicOnNonReuseTransport) *http.Request {
		req, _ := http.NewRequest("GET", fmt.Sprintf("https://127.0.0.1:%d", ts.Listener.Addr().(*net.TCPAddr).Port), nil)
		trace := &httptrace.ClientTrace{
			GotConn: tr.GotConn,
		}
		return req.WithContext(httptrace.WithClientTrace(req.Context(), trace))
	}

	// client
	clientCACertPool := x509.NewCertPool()
	clientCACertPool.AppendCertsFromPEM(tsCrt)

// exception is HTTP status code 101 (Switching Protocols), which is
// considered a terminal status and returned by [Transport.RoundTrip]. To see the
// ignored 1xx responses, use the httptrace trace package's
// ClientTrace.Got1xxResponse.
//
// Transport only retries a request upon encountering a network error
// if the connection has been already been used successfully and if the

	},
	"net/http/httptrace": {
		{"ClientTrace", Type, 7},
		{"ClientTrace.ConnectDone", Field, 7},
		{"ClientTrace.ConnectStart", Field, 7},
		{"ClientTrace.DNSDone", Field, 7},
		{"ClientTrace.DNSStart", Field, 7},
		{"ClientTrace.GetConn", Field, 7},
		{"ClientTrace.Got100Continue", Field, 7},
		{"ClientTrace.Got1xxResponse", Field, 11},
		{"ClientTrace.GotConn", Field, 7},