*     we've successfully connected or because no further attempts should be made.
   */
  @Throws(IOException::class)
  internal fun connectTunnel(): ConnectResult {
    val nextTunnelRequest =
      createTunnel()
        ?: return ConnectResult(plan = this) // Success.

    // The proxy decided to close the connection after an auth challenge. Retry with different
    // auth credentials.
    rawSocket?.closeQuietly()

        }

        @Override
        protected ExecutionResult doRun() {
            def runnerResult = createRunner().build()
            return OutputScrapingExecutionResult.from(runnerResult.output, "")
        }

        @Override
        protected ExecutionFailure doRunWithFailure() {
            def runnerResult = createRunner().buildAndFail()
            return OutputScrapingExecutionFailure.from(runnerResult.output, "")
        }