}
    connectionListener.noNewExchanges(this)
  }

  /** Prevent this connection from being used for hosts other than the one in [route]. */
  internal fun noCoalescedConnections() {
    withLock {
      noCoalescedConnections = true
    }
  }

  internal fun incrementSuccessCount() {
    withLock {
      successCount++
    }
  }

  @Throws(IOException::class)
  fun start() {

          return null
        }

        if (exchange == null || !exchange.isCoalescedConnection) {
          return null
        }

        exchange.connection.noCoalescedConnections()
        return userResponse.request
      }

      else -> {
        return null
      }
    }
  }

  private fun buildRedirectRequest(
    userResponse: Response,