Header("content-type", "text/plain"),
      )
    stream.writeHeaders(
      responseHeaders = responseHeaders,
      outFinished = false,
      flushHeaders = false,
    )
    val out = stream.getSink().buffer()
    out.writeUtf8("Not found: $path")
    out.close()
  }

  private fun serveDirectory(
    stream: Http2Stream,
    files: Array<File>,
  ) {
    val responseHeaders =
      listOf(

    val stream2 = connection.newStream(headerEntries("b", "banana"), true)
    connection.writePingAndAwaitPong() // Ensure the GO_AWAY that resets stream2 has been received.
    val sink1 = stream1.getSink().buffer()
    val sink2 = stream2.getSink().buffer()
    sink1.writeUtf8("abc")
    assertFailsWith<IOException> {
      sink2.writeUtf8("abc")
      sink2.flush()
    }.also { expected ->

    } else {
      Protocol.HTTP_2
    }

  @Volatile
  private var canceled = false

  override fun createRequestBody(
    request: Request,
    contentLength: Long,
  ): Sink {
    return stream!!.getSink()
  }

  override fun writeRequestHeaders(request: Request) {
    if (stream != null) return

    val hasRequestBody = request.body != null
    val requestHeaders = http2HeadersList(request)

  // pair has matching devices or no devices.
  if (auto source = llvm::dyn_cast<tf_executor::NextIterationSourceOp>(op)) {
    return ops_have_same_device(source, source.GetSink());
  } else if (auto sink = llvm::dyn_cast<tf_executor::NextIterationSinkOp>(op)) {
    return ops_have_same_device(sink.GetSource(), sink);
  }

  return llvm::isa<tf_executor::EnterOp, tf_executor::ExitOp,

				t.Errorf("managerImpl.processShutdownEvent() error = %v, wantErr %v", err, tt.wantErr)
			}

			underlier, ok := logger.GetSink().(ktesting.Underlier)
			if !ok {
				t.Fatalf("Should have had a ktesting LogSink, got %T", logger.GetSink())
			}

			log := underlier.GetBuffer().String()
			if !strings.Contains(log, tt.expectedOutputContains) {
				// Log will be shown on failure. To see it

  /**
   * Returns a sink that can be used to write data to the peer.
   *
   * @throws IllegalStateException if this stream was initiated by the peer and a [writeHeaders] has
   *     not yet been sent.
   */
  fun getSink(): Sink {
    this.withLock {
      check(hasResponseHeaders || isLocallyInitiated) {
        "reply before requesting the sink"
      }
    }
    return sink
  }

  /**

      }
      pushPromises(stream, request, response.pushPromises)
      if (body != null) {
        sleepNanos(bodyDelayNanos)
        val responseBodySink =
          stream.getSink().withThrottlingAndSocketPolicy(
            policy = response,
            disconnectHalfway = response.socketPolicy == DisconnectDuringResponseBody,
            expectedByteCount = body.contentLength,

    // source.
    if (auto next_iter_source =
            llvm::dyn_cast<mlir::tf_executor::NextIterationSourceOp>(
                input_inst))
      input_inst = next_iter_source.GetSink();

    auto node_it = nodes_.find(input_inst);
    TF_RET_CHECK(node_it != nodes_.end())
        << "Use of OpResult encountered before def!";
    if (mlir::isa<mlir::tf_executor::ControlType>(input_result.getType())) {

    // source.
    if (auto next_iter_source =
            llvm::dyn_cast<mlir::tf_executor::NextIterationSourceOp>(
                input_inst))
      input_inst = next_iter_source.GetSink();

    auto node_it = nodes_.find(input_inst);
    TF_RET_CHECK(node_it != nodes_.end())
        << "Use of OpResult encountered before def!";
    if (mlir::isa<mlir::tf_executor::ControlType>(input_result.getType())) {

		}
	}

	return nil
}

func AddLoopbackRoutes(cfg *Config) error {
	return forEachLoopbackRoute(cfg, netlink.RouteReplace)
}

func DelLoopbackRoutes(cfg *Config) error {
	return forEachLoopbackRoute(cfg, netlink.RouteDel)
}

func forEachLoopbackRoute(cfg *Config, f func(*netlink.Route) error) error {
	loopbackLink, err := netlink.LinkByName("lo")
	if err != nil {