}
        }
      } else if (!isMultiplexed || e is ConnectionShutdownException) {
        noNewExchangesEvent = !noNewExchanges
        noNewExchanges = true

        // If this route hasn't completed a call, avoid it for new connections.
        if (successCount == 0) {
          if (e != null) {
            connectFailed(call.client, route, e)
          }
          routeFailureCount++
        }

  }

  fun cancel() {
    codec.cancel()
  }

  /**
   * Revoke this exchange's access to streams. This is necessary when a follow-up request is
   * required but the preceding exchange hasn't completed yet.
   */
  fun detachWithViolence() {
    codec.cancel()
    call.messageDone(this, requestDone = true, responseDone = true, e = null)
  }

  private fun trackFailure(e: IOException) {

333F          ; mapped                 ; 30DB 30F3     # 1.1  SQUARE HON
3340          ; mapped                 ; 30DD 30F3 30C9 #1.1  SQUARE PONDO
3341          ; mapped                 ; 30DB 30FC 30EB #1.1  SQUARE HOORU
3342          ; mapped                 ; 30DB 30FC 30F3 #1.1  SQUARE HOON
3343          ; mapped                 ; 30DE 30A4 30AF 30ED #1.1 SQUARE MAIKURO

            try {
              plan.connectTcp()
            } catch (e: Throwable) {
              ConnectResult(plan, throwable = e)
            }
          // Only post a result if this hasn't since been canceled.
          if (plan in tcpConnectsInFlight) {
            connectResults.put(connectResult)
          }
          return -1L
        }
      },
    )
    return null
  }

Calls can be canceled from any thread. This will fail the call if it hasn’t yet completed! Code that is writing the request body or reading the response body will suffer an `IOException` when its call is canceled.

## Dispatch

    client.processNextFrame() // Pong.

    // After 1000ms the client will attempt a ping 2, but we don't process it. That'll cause the
    // client to fail at 1500ms when it's time to send ping 3 because pong 2 hasn't been received.
    taskFaker.advanceUntil(ns(1000L))
    taskFaker.advanceUntil(ns(1500L))
    client.listener.assertFailure(
      SocketTimeoutException::class.java,