*
 * <pre>{@code
 * FluentFuture<UserName> userName =
 *     ClosingFuture.submit(
 *             closer -> closer.eventuallyClose(database.newTransaction(), closingExecutor),
 *             executor)
 *         .transformAsync((closer, transaction) -> transaction.queryClosingFuture("..."), executor)
 *         .transform((closer, result) -> result.get("userName"), directExecutor())

 *
 * <pre>{@code
 * FluentFuture<UserName> userName =
 *     ClosingFuture.submit(
 *             closer -> closer.eventuallyClose(database.newTransaction(), closingExecutor),
 *             executor)
 *         .transformAsync((closer, transaction) -> transaction.queryClosingFuture("..."), executor)
 *         .transform((closer, result) -> result.get("userName"), directExecutor())

			}
			t.Cleanup(func() { bresp.Body.Close() })

			// Try to cause a race. Canceling the client request will cause the client
			// transport to close req2.Body. Returning from the server handler will
			// cause the server to close req.Body. Since they are the same underlying
			// ReadCloser, that will result in concurrent calls to Close (and possibly a
			// Read concurrent with a Close).
			if mode == http2Mode {

	}
	dc := db.freeConn[0]
	if dc.closed {
		t.Errorf("conn shouldn't be closed")
	}

	if n := len(dc.openStmt); n != 1 {
		t.Errorf("driverConn num openStmt = %d; want 1", n)
	}
	err = db.Close()
	if err != nil {
		t.Errorf("db Close = %v", err)
	}
	if !dc.closed {
		t.Errorf("after db.Close, driverConn should be closed")
	}
	if n := len(dc.openStmt); n != 0 {

	si          driver.Stmt
	closed      bool
	closeErr    error // return value of previous Close call
}

// Close ensures driver.Stmt is only closed once and always returns the same
// result.
func (ds *driverStmt) Close() error {
	ds.Lock()
	defer ds.Unlock()
	if ds.closed {
		return ds.closeErr
	}
	ds.closed = true
	ds.closeErr = ds.si.Close()
	return ds.closeErr
}

		io.Copy(io.Discard, r.Body)
	})).ts

	c := ts.Client()

	closes := 0

	res, err := c.Post(ts.URL, "text/plain", countCloseReader{&closes, strings.NewReader("hello")})
	if err != nil {
		t.Fatal(err)
	}
	res.Body.Close()
	if closes != 1 {
		t.Errorf("closes = %d; want 1", closes)
	}
}

func TestTransportTLSHandshakeTimeout(t *testing.T) {
	defer afterTest(t)

	listenerGroup sync.WaitGroup
}

// Close immediately closes all active net.Listeners and any
// connections in state [StateNew], [StateActive], or [StateIdle]. For a
// graceful shutdown, use [Server.Shutdown].
//
// Close does not attempt to close (and does not even know about)
// any hijacked connections, such as WebSockets.
//
// Close returns any error returned from closing the [Server]'s

    callback.await(server.url("/a")).assertFailure("Canceled", "Socket closed", "Socket is closed")
  }

  @Test
  fun cancelAll() {
    val call = client.newCall(Request(server.url("/")))
    call.enqueue(callback)
    client.dispatcher.cancelAll()
    callback.await(server.url("/")).assertFailure("Canceled", "Socket closed", "Socket is closed")
  }

  @Test
  fun cancelWhileRequestHeadersAreSent() {

	//    wait.Until() loops with `period` until the `stopCh` is closed :
	//        wait.PollImmediateUntil() loops with 100ms (hardcode) util the `stopCh` is closed:
	//            GetDeletableResources()
	//            gc.resyncMonitors()
	//            cache.WaitForNamedCacheSync() loops with `syncedPollPeriod` (hardcoded to 100ms), until either its stop channel is closed after `period`, or all caches synced.
	//

		for _, mf := range mfs {
			if err := enc.Encode(mf); err != nil {
				// client may disconnect for any reasons
				// we do not have to log this.
				return
			}
		}
		if closer, ok := enc.(expfmt.Closer); ok {
			closer.Close()
		}
	})
}

func metricsBucketHandler() http.Handler {
	return metricsHTTPHandler(bucketCollector, "handler.MetricsBucket")
}