Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\StackMiddleware\KernelPreHandle.
+ */
+
+namespace Drupal\Core\StackMiddleware;
+
+use Drupal\Core\DrupalKernelInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+/**
+ * Prepares the environment after page caching ran.
+ */
+class KernelPreHandle implements HttpKernelInterface {
+
+  /**
+   * The wrapped HTTP kernel.
+   *
+   * @var \Symfony\Component\HttpKernel\HttpKernelInterface
+   */
+  protected $httpKernel;
+
+  /**
+   * The main Drupal kernel.
+   *
+   * @var \Drupal\Core\DrupalKernelInterface
+   */
+  protected $drupalKernel;
+
+  /**
+   * Constructs a new KernelPreHandle instance.
+   *
+   * @param \Symfony\Component\HttpKernel\HttpKernelInterface $http_kernel
+   *   The wrapped HTTP kernel.
+   *
+   * @param \Drupal\Core\DrupalKernelInterface $drupal_kernel
+   *   The main Drupal kernel.
+   */
+  public function __construct(HttpKernelInterface $http_kernel, DrupalKernelInterface $drupal_kernel) {
+    $this->httpKernel = $http_kernel;
+    $this->drupalKernel = $drupal_kernel;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function handle(Request $request, $type = self::MASTER_REQUEST, $catch = TRUE) {
+    $this->drupalKernel->preHandle($request);
+
+    return $this->httpKernel->handle($request, $type, $catch);
+  }
+
+}
+

core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\StackMiddleware\NegotiationMiddleware.
+ */
+
+namespace Drupal\Core\StackMiddleware;
+
+use Drupal\Core\ContentNegotiation;
+use Drupal\Core\ContentNegotiationInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+/**
+ * Provides a middleware to determine the content type upon the accept header.
+ *
+ * @todo This is a temporary solution, remove this in https://www.drupal.org/node/2364011
+ */
+class NegotiationMiddleware implements HttpKernelInterface {
+
+  /**
+   * The wrapped HTTP kernel.
+   *
+   * @var \Symfony\Component\HttpKernel\HttpKernelInterface
+   */
+  protected $app;
+
+  /**
+   * The content negotiator.
+   *
+   * @var \Drupal\Core\ContentNegotiation
+   */
+  protected $negotiator;
+
+  /**
+   * Contains a hashmap of format as key and mimetype as value.
+   *
+   * @var array
+   */
+  protected $formats = [];
+
+  /**
+   * Constructs a new NegotiationMiddleware.
+   *
+   * @param \Symfony\Component\HttpKernel\HttpKernelInterface $app
+   *   The wrapper HTTP kernel
+   * @param \Drupal\Core\ContentNegotiation $negotiator
+   *   The content negotiator.
+   */
+  public function __construct(HttpKernelInterface $app, ContentNegotiation $negotiator) {
+    $this->app = $app;
+    $this->negotiator = $negotiator;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function handle(Request $request, $type = self::MASTER_REQUEST, $catch = true) {
+    // Register available mime types.
+    foreach ($this->formats as $format => $mime_type) {
+      $request->setFormat($format, $mime_type);
+    }
+
+    // Determine the request format using the negotiator.
+    $request->setRequestFormat($this->negotiator->getContentType($request));
+    return $this->app->handle($request, $type, $catch);
+  }
+
+  /**
+   * Registers a format for a given MIME type.
+   *
+   * @param string $format
+   *   The format.
+   * @param string $mime_type
+   *   The MIME type.
+   *
+   * @return $this
+   */
+  public function registerFormat($format, $mime_type) {
+    $this->formats[$format] = $mime_type;
+    return $this;
+  }
+
+}

core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php

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+<?php
+/**
+ * @file
+ * Contains \Drupal\Core\StackMiddleware\ReverseProxyMiddleware.
+ */
+
+namespace Drupal\Core\StackMiddleware;
+
+use Drupal\Core\Site\Settings;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+/**
+ *
+ */
+class ReverseProxyMiddleware implements HttpKernelInterface {
+
+  /**
+   * The decorated kernel.
+   *
+   * @var \Symfony\Component\HttpKernel\HttpKernelInterface
+   */
+  protected $httpKernel;
+
+  /**
+   * The site settings.
+   *
+   * @var \Drupal\Core\Site\Settings
+   */
+  protected $settings;
+
+  /**
+   * Constructs a ReverseProxyMiddleware object.
+   *
+   * @param \Symfony\Component\HttpKernel\HttpKernelInterface $http_kernel
+   *   The decorated kernel.
+   * @param \Drupal\Core\Site\Settings $settings
+   *   The site settings.
+   */
+  public function __construct(HttpKernelInterface $http_kernel, Settings $settings) {
+    $this->httpKernel = $http_kernel;
+    $this->settings = $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function handle(Request $request, $type = self::MASTER_REQUEST, $catch = TRUE) {
+    // Initialize proxy settings.
+    if ($this->settings->get('reverse_proxy', FALSE)) {
+      $reverse_proxy_header = $this->settings->get('reverse_proxy_header', 'X_FORWARDED_FOR');
+      $request::setTrustedHeaderName($request::HEADER_CLIENT_IP, $reverse_proxy_header);
+      $proxies = $this->settings->get('reverse_proxy_addresses', array());
+      if (count($proxies) > 0) {
+        $request::setTrustedProxies($proxies);
+      }
+    }
+    return $this->httpKernel->handle($request, $type, $catch);
+  }
+
+}

core/lib/Drupal/Core/StackMiddleware/Session.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\StackMiddleware\Session.
+ */
+
+namespace Drupal\Core\StackMiddleware;
+
+use Symfony\Component\DependencyInjection\ContainerAwareTrait;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+/**
+ * Wrap session logic around a HTTP request.
+ *
+ * Note, the session service is not injected into this class in order to prevent
+ * premature initialization of session storage (database). Instead the session
+ * service is retrieved from the container only when handling the request.
+ */
+class Session implements HttpKernelInterface {
+
+  use ContainerAwareTrait;
+
+  /**
+   * The wrapped HTTP kernel.
+   *
+   * @var \Symfony\Component\HttpKernel\HttpKernelInterface
+   */
+  protected $httpKernel;
+
+  /**
+   * The session service name.
+   *
+   * @var string
+   */
+  protected $sessionServiceName;
+
+  /**
+   * Constructs a Session stack middleware object.
+   *
+   * @param \Symfony\Component\HttpKernel\HttpKernelInterface $http_kernel
+   *   The decorated kernel.
+   * @param string $service_name
+   *   The name of the session service, defaults to "session".
+   */
+  public function __construct(HttpKernelInterface $http_kernel, $service_name = 'session') {
+    $this->httpKernel = $http_kernel;
+    $this->sessionServiceName = $service_name;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function handle(Request $request, $type = self::MASTER_REQUEST, $catch = TRUE) {
+    if ($type === self::MASTER_REQUEST && PHP_SAPI !== 'cli') {
+      $session = $this->container->get($this->sessionServiceName);
+      $session->start();
+      $request->setSession($session);
+    }
+
+    $result = $this->httpKernel->handle($request, $type, $catch);
+
+    if ($type === self::MASTER_REQUEST && $request->hasSession()) {
+      $request->getSession()->save();
+    }
+
+    return $result;
+  }
+
+}