// the server's doing its 1-byte background read between requests,
// waiting for the connection to maybe close.
func TestServerCancelsReadTimeoutWhenIdle(t *testing.T) { run(t, testServerCancelsReadTimeoutWhenIdle) }
func testServerCancelsReadTimeoutWhenIdle(t *testing.T, mode testMode) {
	runTimeSensitiveTest(t, []time.Duration{
		10 * time.Millisecond,
		50 * time.Millisecond,
		250 * time.Millisecond,