diff --git a/core/modules/file/src/FileAccessControlHandler.php b/core/modules/file/src/FileAccessControlHandler.php
index f4bda3cb7d..c0d5145fe8 100644
--- a/core/modules/file/src/FileAccessControlHandler.php
+++ b/core/modules/file/src/FileAccessControlHandler.php
@@ -59,10 +59,11 @@ protected function checkAccess(EntityInterface $entity, $operation, AccountInter
 
     if ($operation == 'delete' || $operation == 'update') {
       $account = $this->prepareUser($account);
-      $file_uid = $entity->get('uid')->getValue();
-      // Only the file owner can delete and update the file entity.
-      if ($account->id() == $file_uid[0]['target_id']) {
-        return AccessResult::allowed();
+      $file_uid = $entity->get('uid')->target_id;
+      // Only admins or the file owner can delete and update the file entity.
+      // @todo Create a new permission to handle this?
+      if ($account->hasPermission('administer nodes') || ($account->id() == $file_uid)) {
+        return AccessResult::allowed()->cachePerPermissions();
       }
       return AccessResult::forbidden();
     }
@@ -123,8 +124,6 @@ protected function checkCreateAccess(AccountInterface $account, array $context,
     // create file entities that are referenced from another entity
     // (e.g. an image for a article). A contributed module is free to alter
     // this to allow file entities to be created directly.
-    // @todo Update comment to mention REST module when
-    //   https://www.drupal.org/node/1927648 is fixed.
     return AccessResult::neutral();
   }
 
diff --git a/core/modules/file/src/FileServiceProvider.php b/core/modules/file/src/FileServiceProvider.php
new file mode 100644
index 0000000000..35dd4a5df8
--- /dev/null
+++ b/core/modules/file/src/FileServiceProvider.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\file;
+
+
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Core\DependencyInjection\ServiceModifierInterface;
+use Drupal\Core\StackMiddleware\NegotiationMiddleware;
+
+/**
+ * Adds 'application/octet-stream' as a known (bin) format.
+ */
+class FileServiceProvider implements ServiceModifierInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function alter(ContainerBuilder $container) {
+    if ($container->has('http_middleware.negotiation') && is_a($container->getDefinition('http_middleware.negotiation')->getClass(), NegotiationMiddleware::class, TRUE)) {
+      $container->getDefinition('http_middleware.negotiation')->addMethodCall('registerFormat', ['bin', ['application/octet-stream']]);
+    }
+  }
+
+}
diff --git a/core/modules/file/src/Plugin/rest/resource/FileUploadResource.php b/core/modules/file/src/Plugin/rest/resource/FileUploadResource.php
new file mode 100644
index 0000000000..211de1f58b
--- /dev/null
+++ b/core/modules/file/src/Plugin/rest/resource/FileUploadResource.php
@@ -0,0 +1,425 @@
+<?php
+
+namespace Drupal\file\Plugin\rest\resource;
+
+use Drupal\Component\Utility\Bytes;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Utility\Token;
+use Drupal\file\FileInterface;
+use Drupal\rest\ModifiedResourceResponse;
+use Drupal\rest\Plugin\ResourceBase;
+use Drupal\Component\Render\PlainTextOutput;
+use Drupal\Core\Entity\EntityFieldManagerInterface;
+use Drupal\Core\File\FileSystem;
+use Drupal\file\Entity\File;
+use Drupal\rest\Plugin\rest\resource\EntityResourceValidationTrait;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
+use Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Serializer\SerializerInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+
+/**
+ * File upload resource
+ *
+ * @RestResource(
+ *   id = "file:upload",
+ *   label = @Translation("File Upload"),
+ *   serialization_class = "Drupal\file\Entity\File",
+ *   uri_paths = {
+ *     "https://www.drupal.org/link-relations/create" = "/file/upload/{entity_type_id}/{bundle}/{field_name}"
+ *   }
+ * )
+ */
+class FileUploadResource extends ResourceBase {
+
+  use EntityResourceValidationTrait {
+    validate as resourceValidate;
+  }
+
+  /**
+   * The regex used to extract the filename from the content disposition header.
+   *
+   * @var string
+   */
+  const FILENAME_REGEX = '@\bfilename=\"(?<filename>.+)\"@';
+
+  /**
+   * @var \Drupal\Core\File\FileSystem
+   */
+  protected $fileSystem;
+
+  /**
+   * @var \Symfony\Component\Serializer\SerializerInterface|SerializerInterface
+   */
+  protected $serializer;
+
+  /**
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * @var \Drupal\Core\Entity\EntityFieldManagerInterface
+   */
+  protected $entityFieldManager;
+
+  /**
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $currentUser;
+
+  /**
+   * @var \Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface
+   */
+  protected $mimeTypeGuesser;
+
+  /**
+   * @var \Drupal\Core\Utility\Token|Token
+   */
+  protected $token;
+
+  /**
+   * Constructs a FileUploadResource instance.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param array $serializer_formats
+   *   The available serialization formats.
+   * @param \Psr\Log\LoggerInterface $logger
+   *   A logger instance.
+   * @param \Drupal\Core\File\FileSystem $file_system
+   *   The file system service.
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager.
+   * @param \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager
+   *   The entity field manager.
+   * @param \Drupal\Core\Session\AccountInterface $current_user
+   *   The currently authenticated user.
+   * @param \Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface $mime_type_guesser
+   *   The MIME type guesser.
+   * @param \Drupal\Core\Utility\Token $token
+   *   The token replacement instance.
+   *
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, $serializer_formats, LoggerInterface $logger, FileSystem $file_system, EntityTypeManagerInterface $entity_type_manager, EntityFieldManagerInterface $entity_field_manager, AccountInterface $current_user, MimeTypeGuesserInterface $mime_type_guesser, Token $token) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $serializer_formats, $logger);
+    $this->fileSystem = $file_system;
+    $this->entityTypeManager = $entity_type_manager;
+    $this->entityFieldManager = $entity_field_manager;
+    $this->currentUser = $current_user;
+    $this->mimeTypeGuesser = $mime_type_guesser;
+    $this->token = $token;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->getParameter('serializer.formats'),
+      $container->get('logger.factory')->get('rest'),
+      $container->get('file_system'),
+      $container->get('entity_type.manager'),
+      $container->get('entity_field.manager'),
+      $container->get('current_user'),
+      $container->get('file.mime_type.guesser'),
+      $container->get('token')
+    );
+  }
+
+  /**
+   * Creates a file from endpoint.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The current request.
+   * @param string $entity_type_id
+   *   The entity type ID.
+   * @param string $bundle
+   *   The bundle.
+   * @param string $field_name
+   *   The field name.
+   *
+   * @return \Drupal\rest\ModifiedResourceResponse
+   *   A 201 response, on success.
+   */
+  public function post(Request $request, $entity_type_id, $bundle, $field_name) {
+    $filename = $this->validateAndParseContentDispositionHeader($request);
+
+    $field_definition = $this->validateAndLoadFieldDefinition($entity_type_id, $bundle, $field_name);
+
+    $destination = $this->getUploadLocation($field_definition->getSettings());
+
+    // Check the destination file path is writable.
+    if (!file_prepare_directory($destination, FILE_CREATE_DIRECTORY)) {
+      throw new HttpException(500, 'Destination file path is not writable');
+    }
+
+    // Create the file.
+    $file_uri = "{$destination}/{$filename}";
+
+    $temp_file_path = $this->streamUploadData();
+
+    // This will take care of altering $file_uri if a file already exists.
+    file_unmanaged_prepare($temp_file_path, $file_uri);
+
+    // Begin building file entity.
+    $values = [
+      'uid' => $this->currentUser->id(),
+      'filename' => $filename,
+      'filemime' => $this->mimeTypeGuesser->guess($filename),
+      'uri' => $file_uri,
+      // Set the size. This is done in File::preSave() but we validate the file
+      // before it is saved.
+      'filesize' => @filesize($temp_file_path),
+    ];
+    $file = File::create($values);
+
+    // Validate the file entity against entity level validation and field level
+    // validators.
+    $this->validate($file, $field_definition);
+
+    // Move the file to the correct location after validation. Use
+    // FILE_EXISTS_ERROR as the file location has already been determined above
+    // in file_unmanaged_prepare().
+    if (!file_unmanaged_move($temp_file_path, $file_uri, FILE_EXISTS_ERROR)) {
+      throw new HttpException(500, 'Temporary file could not be moved to file location');
+    }
+
+    $file->save();
+
+    // 201 Created responses return the newly created entity in the response
+    // body. These responses are not cacheable, so we add no cacheability
+    // metadata here.
+    $headers = [
+      // @todo Do we want the File URI (for the actual file) like this?
+      'Location' => $file->url(),
+    ];
+
+    return new ModifiedResourceResponse($file, 201, $headers);
+  }
+
+  /**
+   * Streams file upload data to temporary file and moves to file destination.
+   *
+   * @return string
+   *   The temp file path.
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\HttpException
+   */
+  protected function streamUploadData() {
+    // 'rb' is needed so reading works correctly on windows environments too.
+    $file_data = fopen('php://input','rb');
+
+    $temp_file_path = $this->fileSystem->tempnam('temporary://', 'file');
+
+    if ($temp_file = fopen($temp_file_path, 'wb')) {
+      while (!feof($file_data)) {
+        fwrite($temp_file, fread($file_data, 8192));
+      }
+
+      fclose($temp_file);
+    }
+    else {
+      $this->getLogger('file system')->error('Temporary file "%path" could not be opened for file upload', ['%path' => $temp_file_path]);
+      throw new HttpException(500, 'Temporary file could not be opened');
+    }
+
+    fclose($file_data);
+
+    return $temp_file_path;
+  }
+
+  /**
+   * Validates and extracts the filename from the Content-Disposition header.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The request object.
+   *
+   * @return string
+   *   The filename extracted from the header.
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\BadRequestHttpException
+   */
+  protected function validateAndParseContentDispositionHeader(Request $request) {
+    // Firstly, check the header exists.
+    if (!$request->headers->has('content-disposition')) {
+      throw new BadRequestHttpException('"Content-Disposition" header is required. A file name in the format "filename=FILENAME" must be provided');
+    }
+
+    $content_disposition = $request->headers->get('content-disposition');
+
+    // Parse the header value. This regex does not allow an empty filename.
+    // i.e. 'filename=""'. This also matches on a word boundary so other keys
+    // like 'not_a_filename' don't work.
+    if (!preg_match(static::FILENAME_REGEX, $content_disposition, $matches)) {
+      throw new BadRequestHttpException('No filename found in "Content-Disposition" header. A file name in the format "filename=FILENAME" must be provided');
+    }
+
+    // Don't validate the actual filename here, that will be done by the upload
+    // validators in validate().
+    // @see file_validate()
+    $filename = $matches['filename'];
+
+    return $filename;
+  }
+
+  /**
+   * Validates and loads a field definition instance.
+   *
+   * @param string $entity_type_id
+   *   The entity type ID the field is attached to.
+   * @param string $bundle
+   *   The bundle the field is attached to.
+   * @param string $field_name
+   *   The field name.
+   *
+   * @return \Drupal\Core\Field\FieldDefinitionInterface
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\BadRequestHttpException
+   * @throws \Symfony\Component\HttpFoundation\File\Exception\AccessDeniedException
+   */
+  protected function validateAndLoadFieldDefinition($entity_type_id, $bundle, $field_name) {
+    $field_definitions = $this->entityFieldManager->getFieldDefinitions($entity_type_id, $bundle);
+
+    if (!isset($field_definitions[$field_name])) {
+      throw new BadRequestHttpException(sprintf('Field "%s" does not exist', $field_name));
+    }
+
+    // @todo check the definition is a file field.
+    $field_definition = $field_definitions[$field_name];
+
+    if (!$this->entityTypeManager->getAccessControlHandler($entity_type_id)->fieldAccess('create', $field_definition)) {
+      throw new AccessDeniedHttpException(sprintf('Access denied for field "%s"', $field_name));
+    }
+
+    return $field_definition;
+  }
+
+  /**
+   * Validates the file.
+   *
+   * @param \Drupal\file\FileInterface $file
+   *   The file entity to validate.
+   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
+   *   The field definition to validate against.
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException
+   */
+  protected function validate(FileInterface $file, FieldDefinitionInterface $field_definition) {
+    $this->resourceValidate($file);
+
+    // Validate the file based on the field definition configuration.
+    $errors = file_validate($file, $this->getUploadValidators($field_definition));
+
+    if (!empty($errors)) {
+      $message = "Unprocessable Entity: file validation failed.\n";
+      $message .= implode("\n", $errors);
+
+      throw new UnprocessableEntityHttpException($message);
+    }
+  }
+
+  /**
+   * Determines the URI for a file field.
+   *
+   * @param array $settings
+   *   The array of field settings.
+   *
+   * @return string
+   *   An un-sanitized file directory URI with tokens replaced. The result of
+   *   the token replacement is then converted to plain text and returned.
+   */
+  protected function getUploadLocation(array $settings) {
+    $destination = trim($settings['file_directory'], '/');
+
+    // Replace tokens. As the tokens might contain HTML we convert it to plain
+    // text.
+    $destination = PlainTextOutput::renderFromHtml($this->token->replace($destination, []));
+    return $settings['uri_scheme'] . '://' . $destination;
+  }
+
+  /**
+   * Retrieves the upload validators for a field definition.
+   *
+   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
+   *
+   * @return array
+   *   An array suitable for passing to file_save_upload() or the file field
+   *   element's '#upload_validators' property.
+   *
+   * This is copied from \Drupal\file\Plugin\Field\FieldType\FileItem as there
+   * is no entity instance available here that that a FileItem would exist for.
+   */
+  protected function getUploadValidators($field_definition) {
+    $validators = [
+      // Add in our check of the file name length.
+      'file_validate_name_length' => [],
+    ];
+    $settings = $field_definition->getSettings();
+
+    // Cap the upload size according to the PHP limit.
+    $max_filesize = Bytes::toInt(file_upload_max_size());
+    if (!empty($settings['max_filesize'])) {
+      $max_filesize = min($max_filesize, Bytes::toInt($settings['max_filesize']));
+    }
+
+    // There is always a file size limit due to the PHP server limit.
+    $validators['file_validate_size'] = [$max_filesize];
+
+    // Add the extension check if necessary.
+    if (!empty($settings['file_extensions'])) {
+      $validators['file_validate_extensions'] = [$settings['file_extensions']];
+    }
+
+    return $validators;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getBaseRoute($canonical_path, $method) {
+    return new Route($canonical_path, [
+      '_controller' => 'Drupal\rest\RequestHandler::handleRaw',
+    ],
+      $this->getBaseRouteRequirements($method),
+      [],
+      '',
+      [],
+      // The HTTP method is a requirement for this route.
+      [$method]
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getBaseRouteRequirements($method) {
+    $requirements = parent::getBaseRouteRequirements($method);
+
+    // Add the content type format access check. This will enforce that all
+    // incoming requests can only use the 'application/octet-stream'
+    // Content-Type header.
+    $requirements['_content_type_format'] = 'bin';
+    // Allow all serializer formats to be returned as a response format.
+    $requirements['_format'] = implode('|', $this->serializerFormats);
+
+    return $requirements;
+  }
+
+
+}
diff --git a/core/modules/file/tests/src/Functional/FileUploadJsonBasicAuthTest.php b/core/modules/file/tests/src/Functional/FileUploadJsonBasicAuthTest.php
new file mode 100644
index 0000000000..cef59f83cf
--- /dev/null
+++ b/core/modules/file/tests/src/Functional/FileUploadJsonBasicAuthTest.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Drupal\Tests\file\Functional;
+
+use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
+use Drupal\Tests\rest\Functional\FileUploadResourceTestBase;
+
+/**
+ * @group file
+ */
+class FileUploadJsonBasicAuthTest extends FileUploadResourceTestBase {
+
+  use BasicAuthResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['basic_auth'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'basic_auth';
+
+}
diff --git a/core/modules/file/tests/src/Functional/FileUploadJsonCookieTest.php b/core/modules/file/tests/src/Functional/FileUploadJsonCookieTest.php
new file mode 100644
index 0000000000..8f7495a763
--- /dev/null
+++ b/core/modules/file/tests/src/Functional/FileUploadJsonCookieTest.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Drupal\Tests\file\Functional;
+
+use Drupal\Tests\rest\Functional\CookieResourceTestTrait;
+use Drupal\Tests\rest\Functional\FileUploadResourceTestBase;
+
+/**
+ * @group file
+ */
+class FileUploadJsonCookieTest extends FileUploadResourceTestBase {
+
+  use CookieResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'cookie';
+
+}
diff --git a/core/modules/hal/hal.services.yml b/core/modules/hal/hal.services.yml
index b2c898fc56..a2badfa996 100644
--- a/core/modules/hal/hal.services.yml
+++ b/core/modules/hal/hal.services.yml
@@ -16,7 +16,7 @@ services:
     class: Drupal\hal\Normalizer\FileEntityNormalizer
     tags:
       - { name: normalizer, priority: 20 }
-    arguments: ['@entity.manager', '@http_client', '@hal.link_manager', '@module_handler']
+    arguments: ['@entity.manager', '@hal.link_manager', '@module_handler']
   serializer.normalizer.timestamp_item.hal:
    class: Drupal\hal\Normalizer\TimestampItemNormalizer
    tags:
diff --git a/core/modules/hal/src/Normalizer/FileEntityNormalizer.php b/core/modules/hal/src/Normalizer/FileEntityNormalizer.php
index ec870e9e14..5e45d59711 100644
--- a/core/modules/hal/src/Normalizer/FileEntityNormalizer.php
+++ b/core/modules/hal/src/Normalizer/FileEntityNormalizer.php
@@ -4,8 +4,8 @@
 
 use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\file\FileInterface;
 use Drupal\hal\LinkManager\LinkManagerInterface;
-use GuzzleHttp\ClientInterface;
 
 /**
  * Converts the Drupal entity object structure to a HAL array structure.
@@ -17,31 +17,20 @@ class FileEntityNormalizer extends ContentEntityNormalizer {
    *
    * @var string
    */
-  protected $supportedInterfaceOrClass = 'Drupal\file\FileInterface';
-
-  /**
-   * The HTTP client.
-   *
-   * @var \GuzzleHttp\ClientInterface
-   */
-  protected $httpClient;
+  protected $supportedInterfaceOrClass = FileInterface::class;
 
   /**
    * Constructs a FileEntityNormalizer object.
    *
    * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
    *   The entity manager.
-   * @param \GuzzleHttp\ClientInterface $http_client
-   *   The HTTP Client.
    * @param \Drupal\hal\LinkManager\LinkManagerInterface $link_manager
    *   The hypermedia link manager.
    * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
    *   The module handler.
    */
-  public function __construct(EntityManagerInterface $entity_manager, ClientInterface $http_client, LinkManagerInterface $link_manager, ModuleHandlerInterface $module_handler) {
+  public function __construct(EntityManagerInterface $entity_manager, LinkManagerInterface $link_manager, ModuleHandlerInterface $module_handler) {
     parent::__construct($link_manager, $entity_manager, $module_handler);
-
-    $this->httpClient = $http_client;
   }
 
   /**
@@ -55,16 +44,4 @@ public function normalize($entity, $format = NULL, array $context = []) {
     return $data;
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function denormalize($data, $class, $format = NULL, array $context = []) {
-    $file_data = (string) $this->httpClient->get($data['uri'][0]['value'])->getBody();
-
-    $path = 'temporary://' . drupal_basename($data['uri'][0]['value']);
-    $data['uri'] = file_unmanaged_save_data($file_data, $path);
-
-    return $this->entityManager->getStorage('file')->create($data);
-  }
-
 }
diff --git a/core/modules/hal/tests/src/Functional/EntityResource/File/FileUploadHalJsonBasicAuthTest.php b/core/modules/hal/tests/src/Functional/EntityResource/File/FileUploadHalJsonBasicAuthTest.php
new file mode 100644
index 0000000000..9d2348bb88
--- /dev/null
+++ b/core/modules/hal/tests/src/Functional/EntityResource/File/FileUploadHalJsonBasicAuthTest.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\Tests\hal\Functional\EntityResource\File;
+
+use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
+
+/**
+ * @group hal
+ */
+class FileUploadHalJsonBasicAuthTest extends FileUploadHalJsonTestBase {
+
+  use BasicAuthResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['basic_auth'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'basic_auth';
+
+}
diff --git a/core/modules/hal/tests/src/Functional/EntityResource/File/FileUploadHalJsonCookieTest.php b/core/modules/hal/tests/src/Functional/EntityResource/File/FileUploadHalJsonCookieTest.php
new file mode 100644
index 0000000000..dc2dde46fd
--- /dev/null
+++ b/core/modules/hal/tests/src/Functional/EntityResource/File/FileUploadHalJsonCookieTest.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Drupal\Tests\hal\Functional\EntityResource\File;
+
+use Drupal\Tests\rest\Functional\CookieResourceTestTrait;
+
+/**
+ * @group hal
+ */
+class FileUploadHalJsonCookieTest extends FileUploadHalJsonTestBase {
+
+  use CookieResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'cookie';
+
+}
diff --git a/core/modules/hal/tests/src/Functional/EntityResource/File/FileUploadHalJsonTestBase.php b/core/modules/hal/tests/src/Functional/EntityResource/File/FileUploadHalJsonTestBase.php
new file mode 100644
index 0000000000..bc3b1ae9cb
--- /dev/null
+++ b/core/modules/hal/tests/src/Functional/EntityResource/File/FileUploadHalJsonTestBase.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace Drupal\Tests\hal\Functional\EntityResource\File;
+
+
+use Drupal\Tests\rest\Functional\FileUploadResourceTestBase;
+use Drupal\Tests\hal\Functional\EntityResource\HalEntityNormalizationTrait;
+
+abstract class FileUploadHalJsonTestBase extends FileUploadResourceTestBase {
+
+  use HalEntityNormalizationTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['hal'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'hal_json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/hal+json';
+
+  /**
+   * @return array
+   */
+  protected function getExpectedNormalizedEntity($fid = 1) {
+    $normalization = parent::getExpectedNormalizedEntity($fid);
+
+    // Cannot use applyHalFieldNormalization() as it uses the $entity property
+    // from the test class, which in the case of file upload tests, is the
+    // parent entity test entity for the file that's created.
+
+    // Hal uses the full file URL for the URI field.
+    $normalization['uri'][0]['value'] = file_create_url($normalization['uri'][0]['value']);
+    // Hal adds reference fields in links and embedded.
+    unset($normalization['uid']);
+
+    return $normalization + [
+        '_links' => [
+          'self' => [
+            'href' => $normalization['uri'][0]['value'],
+          ],
+          'type' => [
+            'href' => $this->baseUrl . '/rest/type/file/file',
+          ],
+          $this->baseUrl . '/rest/relation/file/file/uid' => [
+            ['href' => $this->baseUrl . '/user/' . $this->account->id() . '?_format=hal_json']
+          ],
+        ],
+        '_embedded' => [
+          $this->baseUrl . '/rest/relation/file/file/uid' => [
+            [
+              '_links' => [
+                'self' => [
+                  'href' => $this->baseUrl . '/user/' . $this->account->id() . '?_format=hal_json',
+                ],
+                'type' => [
+                  'href' => $this->baseUrl . '/rest/type/user/user',
+                ],
+              ],
+              'uuid' => [
+                [
+                  'value' => $this->account->uuid(),
+                ],
+              ],
+            ],
+          ],
+        ],
+      ];
+  }
+
+
+}
diff --git a/core/modules/hal/tests/src/Functional/FileDenormalizeTest.php b/core/modules/hal/tests/src/Functional/FileDenormalizeTest.php
index 05ee234893..8202a367da 100644
--- a/core/modules/hal/tests/src/Functional/FileDenormalizeTest.php
+++ b/core/modules/hal/tests/src/Functional/FileDenormalizeTest.php
@@ -41,35 +41,10 @@ public function testFileDenormalize() {
 
     $this->assertTrue($denormalized instanceof File, 'A File instance was created.');
 
-    $this->assertIdentical('temporary://' . $file->getFilename(), $denormalized->getFileUri(), 'The expected file URI was found.');
-    $this->assertTrue(file_exists($denormalized->getFileUri()), 'The temporary file was found.');
-
     $this->assertIdentical($file->uuid(), $denormalized->uuid(), 'The expected UUID was found');
     $this->assertIdentical($file->getMimeType(), $denormalized->getMimeType(), 'The expected MIME type was found.');
     $this->assertIdentical($file->getFilename(), $denormalized->getFilename(), 'The expected filename was found.');
     $this->assertTrue($denormalized->isPermanent(), 'The file has a permanent status.');
-
-    // Try to denormalize with the file uri only.
-    $file_name = 'test_2.txt';
-    $file_path = 'public://' . $file_name;
-
-    file_put_contents($file_path, 'hello world');
-    $file_uri = file_create_url($file_path);
-
-    $data = [
-      'uri' => [
-        ['value' => $file_uri],
-      ],
-    ];
-
-    $denormalized = $serializer->denormalize($data, 'Drupal\file\Entity\File', 'hal_json');
-
-    $this->assertIdentical('temporary://' . $file_name, $denormalized->getFileUri(), 'The expected file URI was found.');
-    $this->assertTrue(file_exists($denormalized->getFileUri()), 'The temporary file was found.');
-
-    $this->assertIdentical('text/plain', $denormalized->getMimeType(), 'The expected MIME type was found.');
-    $this->assertIdentical($file_name, $denormalized->getFilename(), 'The expected filename was found.');
-    $this->assertFalse($denormalized->isPermanent(), 'The file has a permanent status.');
   }
 
 }
diff --git a/core/modules/media/tests/src/Functional/MediaFunctionalTestTrait.php b/core/modules/media/tests/src/Functional/MediaFunctionalTestTrait.php
index 75e0d06c16..46aabe27c9 100644
--- a/core/modules/media/tests/src/Functional/MediaFunctionalTestTrait.php
+++ b/core/modules/media/tests/src/Functional/MediaFunctionalTestTrait.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace Drupal\Tests\media\Functional;
+use Drupal\Tests\rest\Functional\FileUploadResourceTestBase;
 
 /**
  * Trait with helpers for Media functional tests.
diff --git a/core/modules/rest/src/EventSubscriber/ResourceResponseSubscriber.php b/core/modules/rest/src/EventSubscriber/ResourceResponseSubscriber.php
index df77281f37..8f908193bf 100644
--- a/core/modules/rest/src/EventSubscriber/ResourceResponseSubscriber.php
+++ b/core/modules/rest/src/EventSubscriber/ResourceResponseSubscriber.php
@@ -104,7 +104,7 @@ public function getResponseFormat(RouteMatchInterface $route_match, Request $req
     // If an acceptable format is requested, then use that. Otherwise, including
     // and particularly when the client forgot to specify a format, then use
     // heuristics to select the format that is most likely expected.
-    if (in_array($requested_format, $acceptable_formats)) {
+    if (in_array($requested_format, $acceptable_request_formats)) {
       return $requested_format;
     }
     // If a request body is present, then use the format corresponding to the
diff --git a/core/modules/rest/src/RequestHandler.php b/core/modules/rest/src/RequestHandler.php
index e5437ccb68..2ee1be7dda 100644
--- a/core/modules/rest/src/RequestHandler.php
+++ b/core/modules/rest/src/RequestHandler.php
@@ -6,6 +6,7 @@
 use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
 use Drupal\Core\Entity\EntityStorageInterface;
 use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\rest\Plugin\ResourceInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareTrait;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -60,6 +61,57 @@ public static function create(ContainerInterface $container) {
    *   The response object.
    */
   public function handle(RouteMatchInterface $route_match, Request $request) {
+    $method = $this->getRequestMethod($route_match);
+
+    $resource_config = $this->loadRestResourceConfigFromRouteMatch($route_match);
+    $resource = $resource_config->getResourcePlugin();
+
+    // Deserialize incoming data if available.
+    $unserialized = $this->denormalizeRequestData($request, $resource, $method);
+
+    $parameters = $parameters = $this->prepareRouteParameters($route_match);
+
+    // Invoke the operation on the resource plugin.
+    $response = call_user_func_array([$resource, $method], array_merge($parameters, [$unserialized, $request]));
+
+    return $this->prepareResponse($response, $resource_config);
+  }
+
+  /**
+   * Handles a web API request without deserializing the request content.
+   *
+   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+   *   The route match.
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The HTTP request object.
+   *
+   * @return \Symfony\Component\HttpFoundation\Response
+   *   The response object.
+   */
+  public function handleRaw(RouteMatchInterface $route_match, Request $request) {
+    $method = $this->getRequestMethod($route_match);
+
+    $resource_config = $this->loadRestResourceConfigFromRouteMatch($route_match);
+    $resource = $resource_config->getResourcePlugin();
+
+    $parameters = $this->prepareRouteParameters($route_match);
+
+    // Invoke the operation on the resource plugin.
+    $response = call_user_func_array([$resource, $method], array_merge([$request], $parameters));
+
+    return $this->prepareResponse($response, $resource_config);
+  }
+
+  /**
+   * Gets the request method from the route match.
+   *
+   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+   *   The route match interface.
+   *
+   * @return string
+   *   The request method.
+   */
+  protected function getRequestMethod(RouteMatchInterface $route_match) {
     // Symfony is built to transparently map HEAD requests to a GET request. In
     // the case of the REST module's RequestHandler though, we essentially have
     // our own light-weight routing system on top of the Drupal/symfony routing
@@ -74,18 +126,69 @@ public function handle(RouteMatchInterface $route_match, Request $request) {
     $method = strtolower($route_match->getRouteObject()->getMethods()[0]);
     assert(count($route_match->getRouteObject()->getMethods()) === 1);
 
+    return $method;
+  }
 
+  /**
+   * Loads a REST resource plugin from the route match object.
+   *
+   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+   *   The route match instance.
+   *
+   * @return \Drupal\rest\RestResourceConfigInterface
+   *   The loaded REST config.
+   */
+  protected function loadRestResourceConfigFromRouteMatch(RouteMatchInterface $route_match) {
     $resource_config_id = $route_match->getRouteObject()->getDefault('_rest_resource_config');
-    /** @var \Drupal\rest\RestResourceConfigInterface $resource_config */
-    $resource_config = $this->resourceStorage->load($resource_config_id);
-    $resource = $resource_config->getResourcePlugin();
+    return $this->resourceStorage->load($resource_config_id);
+  }
 
-    // Deserialize incoming data if available.
-    /** @var \Symfony\Component\Serializer\SerializerInterface $serializer */
-    $serializer = $this->container->get('serializer');
+  /**
+   * Determines the request parameters to pass to the resource plugin.
+   *
+   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+   *   The route match instance.
+   *
+   * @return array
+   *   The route parameters to pass to the resource plugin.
+   */
+  protected function prepareRouteParameters(RouteMatchInterface $route_match) {
+    $route_parameters = $route_match->getParameters();
+    $parameters = [];
+    // Filter out all internal parameters starting with "_".
+    foreach ($route_parameters as $key => $parameter) {
+      if ($key{0} !== '_') {
+        $parameters[] = $parameter;
+      }
+    }
+
+    return $parameters;
+  }
+
+  /**
+   * Deserializes and denormalizes request content.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The current request.
+   * @param \Drupal\rest\Plugin\ResourceInterface $resource
+   *   The REST resource plugin.
+   * @param string $method
+   *   The request method.
+   *
+   * @return mixed|NULL
+   *   The denormalized \Drupal\Core\Entity\EntityInterface object if there is a
+   *   serialization class, an array of decoded data, or NULL if there is no
+   *   request content.
+   *
+   */
+  protected function denormalizeRequestData(Request $request, ResourceInterface $resource, $method) {
     $received = $request->getContent();
     $unserialized = NULL;
+
     if (!empty($received)) {
+      /** @var \Symfony\Component\Serializer\SerializerInterface $serializer */
+      $serializer = $this->container->get('serializer');
+
       $format = $request->getContentType();
 
       $definition = $resource->getPluginDefinition();
@@ -106,8 +209,8 @@ public function handle(RouteMatchInterface $route_match, Request $request) {
         try {
           $unserialized = $serializer->denormalize($unserialized, $definition['serialization_class'], $format, ['request_method' => $method]);
         }
-        // These two serialization exception types mean there was a problem
-        // with the structure of the decoded data and it's not valid.
+          // These two serialization exception types mean there was a problem
+          // with the structure of the decoded data and it's not valid.
         catch (UnexpectedValueException $e) {
           throw new UnprocessableEntityHttpException($e->getMessage());
         }
@@ -117,20 +220,22 @@ public function handle(RouteMatchInterface $route_match, Request $request) {
       }
     }
 
-    // Determine the request parameters that should be passed to the resource
-    // plugin.
-    $route_parameters = $route_match->getParameters();
-    $parameters = [];
-    // Filter out all internal parameters starting with "_".
-    foreach ($route_parameters as $key => $parameter) {
-      if ($key{0} !== '_') {
-        $parameters[] = $parameter;
-      }
-    }
-
-    // Invoke the operation on the resource plugin.
-    $response = call_user_func_array([$resource, $method], array_merge($parameters, [$unserialized, $request]));
+    return $unserialized;
+  }
 
+  /**
+   * Prepares the REST response.
+   *
+   * @TODO is there are requirement that REST resources MUST return a response
+   *   object? If so, we can type hint that here.
+   *
+   * @param $response
+   * @param \Drupal\rest\RestResourceConfigInterface $resource_config
+   *   The REST resource config entity.
+   *
+   * @return $response
+   */
+  protected function prepareResponse($response, RestResourceConfigInterface $resource_config) {
     if ($response instanceof CacheableResponseInterface) {
       // Add rest config's cache tags.
       $response->addCacheableDependency($resource_config);
diff --git a/core/modules/rest/src/Routing/ResourceRoutes.php b/core/modules/rest/src/Routing/ResourceRoutes.php
index 5ba4c5da62..c5e1fa006f 100644
--- a/core/modules/rest/src/Routing/ResourceRoutes.php
+++ b/core/modules/rest/src/Routing/ResourceRoutes.php
@@ -108,20 +108,12 @@ protected function getRoutesForResourceConfig(RestResourceConfigInterface $rest_
           continue;
         }
 
-        // If the route has a format requirement, then verify that the
-        // resource has it.
-        $format_requirement = $route->getRequirement('_format');
-        if ($format_requirement && !in_array($format_requirement, $rest_resource_config->getFormats($method))) {
-          continue;
-        }
-
         // The configuration has been validated, so we update the route to:
         // - set the allowed request body content types/formats for methods that
         //   allow request bodies to be sent
         // - set the allowed authentication providers
-        if (in_array($method, ['POST', 'PATCH', 'PUT'], TRUE)) {
-          // Restrict the incoming HTTP Content-type header to the allowed
-          // formats.
+        // @todo clean this up further in https://www.drupal.org/node/2858482
+        if (in_array($method, ['POST', 'PATCH', 'PUT'], TRUE) && !$route->hasRequirement('_content_type_format')) {
           $route->addRequirements(['_content_type_format' => implode('|', $rest_resource_config->getFormats($method))]);
         }
         $route->setOption('_auth', $rest_resource_config->getAuthenticationProviders($method));
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
index f39b7d8fba..73bb97bccc 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
@@ -664,27 +664,6 @@ protected static function castToString(array $normalization) {
     return $normalization;
   }
 
-  /**
-   * Recursively sorts an array by key.
-   *
-   * @param array $array
-   *   An array to sort.
-   *
-   * @return array
-   *   The sorted array.
-   */
-  protected static function recursiveKSort(array &$array) {
-    // First, sort the main array.
-    ksort($array);
-
-    // Then check for child arrays.
-    foreach ($array as $key => &$value) {
-      if (is_array($value)) {
-        static::recursiveKSort($value);
-      }
-    }
-  }
-
   /**
    * Tests a POST request for an entity, plus edge cases to ensure good DX.
    */
diff --git a/core/modules/rest/tests/src/Functional/FileUploadResourceTestBase.php b/core/modules/rest/tests/src/Functional/FileUploadResourceTestBase.php
new file mode 100644
index 0000000000..59019e3fe2
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/FileUploadResourceTestBase.php
@@ -0,0 +1,447 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional;
+
+use Drupal\Component\Utility\NestedArray;
+use Drupal\Core\Field\FieldStorageDefinitionInterface;
+use Drupal\Core\Url;
+use Drupal\entity_test\Entity\EntityTest;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\file\Entity\File;
+use Drupal\Tests\RandomGeneratorTrait;
+use Drupal\Tests\rest\Functional\BcTimestampNormalizerUnixTestTrait;
+use Drupal\Tests\rest\Functional\ResourceTestBase;
+use Drupal\user\Entity\User;
+use GuzzleHttp\RequestOptions;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Tests binary data file upload route.
+ */
+abstract class FileUploadResourceTestBase extends ResourceTestBase {
+
+  use RandomGeneratorTrait, BcTimestampNormalizerUnixTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['rest_test', 'entity_test', 'file'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $resourceConfigId = 'file.upload';
+
+  /**
+   * The POST URI.
+   *
+   * @var string
+   */
+  protected static $postUri = 'file/upload/entity_test/entity_test/field_rest_file_test';
+
+  /**
+   * Test file data.
+   *
+   * @var string
+   */
+  protected $testFileData = 'Hares sit on chairs, and mules sit on stools.';
+
+  /**
+   * The test field storage config.
+   *
+   * @var \Drupal\field\Entity\FieldStorageConfig
+   */
+  protected $fieldStorage;
+
+  /**
+   * The field config.
+   *
+   * @var \Drupal\field\Entity\FieldConfig
+   */
+  protected $field;
+
+  /**
+   * The parent entity.
+   *
+   * @var \Drupal\Core\Entity\EntityInterface
+   */
+  protected $entity;
+
+  /**
+   * Created file entity.
+   *
+   * @var \Drupal\file\Entity\File
+   */
+  protected $file;
+
+  /**
+   * An authenticated user.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $user;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+
+    // Add a file field.
+    $this->fieldStorage = FieldStorageConfig::create([
+      'entity_type' => 'entity_test',
+      'field_name' => 'field_rest_file_test',
+      'type' => 'file',
+      'settings' => [
+        'uri_scheme' => 'public',
+      ],
+    ])
+      ->setCardinality(FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);
+    $this->fieldStorage->save();
+
+    $this->field = FieldConfig::create([
+      'entity_type' => 'entity_test',
+      'field_name' => 'field_rest_file_test',
+      'bundle' => 'entity_test',
+      'settings' => [
+        'file_directory' => 'foobar',
+        'file_extensions' => 'txt',
+        'max_filesize' => '',
+      ],
+    ])
+      ->setLabel('Test file field')
+      ->setTranslatable(FALSE);
+    $this->field->save();
+
+    // Create an entity that a file can be attached to.
+    $this->entity = EntityTest::create([
+      'name' => 'Llama',
+      'type' => 'entity_test',
+    ]);
+    $this->entity->setOwnerId(isset($this->account) ? $this->account->id() : 0);
+    $this->entity->save();
+
+    $this->refreshTestStateAfterRestConfigChange();
+  }
+
+  /**
+   * Tests using the file upload POST route.
+   */
+  public function testPostFileUpload() {
+    $this->initAuthentication();
+
+    $this->provisionResource([static::$format], static::$auth ? [static::$auth] : [], ['POST']);
+
+    $this->setUpAuthorization('POST');
+
+    $uri = Url::fromUri('base:' . static::$postUri);
+
+    // The wrong content type header should return a 415 code.
+    $response = $this->fileRequest($uri, $this->testFileData, ['Content-Type' => static::$mimeType]);
+    $this->assertSame(415, $response->getStatusCode());
+
+    // An empty Content-Disposition header should return a 400.
+    $response = $this->fileRequest($uri, $this->testFileData, ['Content-Disposition' => '']);
+    $this->assertSame(400, $response->getStatusCode());
+
+    // An empty filename with a context in the Content-Disposition header should
+    // return a 400.
+    $response = $this->fileRequest($uri, $this->testFileData, ['Content-Disposition' => 'file; filename=""']);
+    $this->assertSame(400, $response->getStatusCode());
+
+    // An empty filename without a context in the Content-Disposition header
+    // should return a 400.
+    $response = $this->fileRequest($uri, $this->testFileData, ['Content-Disposition' => 'filename=""']);
+    $this->assertSame(400, $response->getStatusCode());
+
+    // An invalid key-value pair in the Content-Disposition header should return
+    // a 400.
+    $response = $this->fileRequest($uri, $this->testFileData, ['Content-Disposition' => 'not_a_filename="example.txt"']);
+    $this->assertSame(400, $response->getStatusCode());
+
+    // This request will have the default 'application/octet-stream' content
+    // type header.
+    $response = $this->fileRequest($uri, $this->testFileData);
+
+    $this->assertSame(201, $response->getStatusCode());
+
+    $expected = $this->getExpectedNormalizedEntity();
+
+    $this->assertResponseData($expected, $response);
+
+    // Check the actual file data.
+    $this->assertSame($this->testFileData, file_get_contents('public://foobar/example.txt'));
+  }
+
+  /**
+   * Tests using the file upload POST route with a duplicate file.
+   *
+   * A new file should be created with a suffixed name.
+   */
+  public function testPostFileUploadDuplicateFile() {
+    $this->initAuthentication();
+
+    $this->provisionResource([static::$format], static::$auth ? [static::$auth] : [], ['POST']);
+
+    $this->setUpAuthorization('POST');
+
+    $uri = Url::fromUri('base:' . static::$postUri);
+
+    // This request will have the default 'application/octet-stream' content
+    // type header.
+    $response = $this->fileRequest($uri, $this->testFileData);
+
+    $this->assertSame(201, $response->getStatusCode());
+
+    // Make the same request again. The file should be saved as a new file
+    // entity that has the same file name but a suffixed file URI.
+    $response = $this->fileRequest($uri, $this->testFileData);
+
+    $this->assertSame(201, $response->getStatusCode());
+
+    // Loading expected normalized data for file 2.
+    $expected = $this->getExpectedNormalizedEntity(2);
+    // Update the file URI to match the generated name.
+    $expected['uri'][0]['value'] = 'public://foobar/example_0.txt';
+
+    $this->assertResponseData($expected, $response);
+
+    // Check the actual file data.
+    $this->assertSame($this->testFileData, file_get_contents('public://foobar/example_0.txt'));
+  }
+
+  /**
+   * Tests using the file upload route with a zero byte file.
+   */
+  public function testFileUploadZeroByteFile() {
+    $this->initAuthentication();
+
+    $this->provisionResource([static::$format], static::$auth ? [static::$auth] : [], ['POST']);
+
+    $this->setUpAuthorization('POST');
+
+    $uri = Url::fromUri('base:' . static::$postUri);
+
+    // Test with a zero byte file.
+    $response = $this->fileRequest($uri, NULL);
+
+    $this->assertSame(201, $response->getStatusCode());
+
+    $expected = $this->getExpectedNormalizedEntity();
+    // Modify the default expected data to account for the 0 byte file.
+    $expected['filesize'][0]['value'] = 0;
+
+    $this->assertResponseData($expected, $response);
+
+    // Check the actual file data.
+    $this->assertSame('', file_get_contents('public://foobar/example.txt'));
+  }
+
+  /**
+   * Tests using the file upload route with an invalid file type.
+   */
+  public function testFileUploadInvalidFileType() {
+    $this->initAuthentication();
+
+    $this->provisionResource([static::$format], static::$auth ? [static::$auth] : [], ['POST']);
+
+    $this->setUpAuthorization('POST');
+
+    $uri = Url::fromUri('base:' . static::$postUri);
+
+    // Test with a JSON file.
+    $response = $this->fileRequest($uri, '{"test":123}', ['Content-Disposition' => 'filename="example.json"']);
+
+    $this->assertSame(422, $response->getStatusCode());
+
+    // Make sure that no file was saved.
+    $this->assertEmpty(File::load(1));
+    $this->assertFalse(file_exists('public://foobar/example.txt'));
+  }
+
+  /**
+   * Tests using the file upload route with a file size larger than allowed.
+   */
+  public function testFileUploadLargerFileSize() {
+    // Set a limit of 50 bytes.
+    $this->field->setSetting('max_filesize', 50)
+      ->save();
+    $this->refreshTestStateAfterRestConfigChange();
+
+    $this->initAuthentication();
+
+    $this->provisionResource([static::$format], static::$auth ? [static::$auth] : [], ['POST']);
+
+    $this->setUpAuthorization('POST');
+
+    $uri = Url::fromUri('base:' . static::$postUri);
+
+    // Generate a string larger than the 50 byte limit set.
+    $response = $this->fileRequest($uri, $this->randomString(100));
+
+    $this->assertSame(422, $response->getStatusCode());
+
+    // Make sure that no file was saved.
+    $this->assertEmpty(File::load(1));
+    $this->assertFalse(file_exists('public://foobar/example.txt'));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function assertNormalizationEdgeCases($method, Url $url, array $request_options) {
+    // TODO: Implement assertNormalizationEdgeCases() method.
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getExpectedUnauthorizedAccessMessage($method) {
+    // TODO: Implement getExpectedUnauthorizedAccessMessage() method.
+  }
+
+  /**
+   * Gets the expected file entity.
+   *
+   * @param int $fid
+   *   The file ID to load and create normalized data for.
+   *
+   * @return array
+   *   The expected normalized data array.
+   */
+  protected function getExpectedNormalizedEntity($fid = 1) {
+    $author = User::load(static::$auth ? $this->account->id() : 0);
+    $file = File::load($fid);
+
+    $expected_normalization = [
+      'fid' => [
+        [
+          'value' => (int) $file->id(),
+        ],
+      ],
+      'uuid' => [
+        [
+          'value' => $file->uuid(),
+        ],
+      ],
+      'langcode' => [
+        [
+          'value' => 'en',
+        ],
+      ],
+      'uid' => [
+        [
+          'target_id' => (int) $author->id(),
+          'target_type' => 'user',
+          'target_uuid' => $author->uuid(),
+          'url' => base_path() . 'user/' . $author->id(),
+        ],
+      ],
+      'filename' => [
+        [
+          'value' => 'example.txt',
+        ],
+      ],
+      'uri' => [
+        [
+          'value' => 'public://foobar/example.txt',
+        ],
+      ],
+      'filemime' => [
+        [
+          'value' => 'text/plain',
+        ],
+      ],
+      'filesize' => [
+        [
+          'value' => strlen($this->testFileData),
+        ],
+      ],
+      'status' => [
+        [
+          'value' => FALSE,
+        ],
+      ],
+      'created' => [
+        $this->formatExpectedTimestampItemValues($file->getCreatedTime()),
+      ],
+      'changed' => [
+        $this->formatExpectedTimestampItemValues($file->getChangedTime()),
+      ],
+    ];
+
+    return $expected_normalization;
+  }
+
+  /**
+   * Performs a file upload request. Wraps the Guzzle HTTP client.
+   *
+   * @see \GuzzleHttp\ClientInterface::request()
+   *
+   * @param \Drupal\Core\Url $url
+   *   URL to request.
+   * @param string $file_contents
+   *   The file contents to send as the request body.
+   * @param array $headers
+   *   Additional headers to send with the request. Defaults will be added for
+   *   Content-Type and Content-Disposition.
+   *
+   * @return \Psr\Http\Message\ResponseInterface
+   */
+  protected function fileRequest(Url $url, $file_contents, array $headers = []) {
+    // Set the format for the response.
+    $url->setOption('query', ['_format' => static::$format]);
+
+    $request_options = [];
+    $request_options[RequestOptions::HTTP_ERRORS] = FALSE;
+
+    $request_options['headers'] = $headers + [
+      // Set the required (and only accepted) content type for the request.
+      'Content-Type' => 'application/octet-stream',
+      // Set the required Content-Disposition header for the file name.
+      'Content-Disposition' => 'file; filename="example.txt"',
+    ];
+
+    $request_options['body'] = $file_contents;
+
+    $request_options = NestedArray::mergeDeep($request_options, $this->getAuthenticationRequestOptions('POST'));
+
+    $session = $this->getSession();
+    $this->prepareRequest();
+
+    $client = $session->getDriver()->getClient()->getClient();
+    return $client->request('POST', $url->setAbsolute(TRUE)->toString(), $request_options);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUpAuthorization($method) {
+    switch ($method) {
+      case 'GET':
+        $this->grantPermissionsToTestedRole(['view test entity']);
+        break;
+      case 'POST':
+        $this->grantPermissionsToTestedRole(['create entity_test entity_test entities', 'restful post file:upload']);
+        break;
+    }
+  }
+
+  /**
+   * Asserts expected normalized data matches response data.
+   *
+   * @param array $expected
+   *   The expected data.
+   * @param \Psr\Http\Message\ResponseInterface $response
+   *   The file upload response.
+   */
+  protected function assertResponseData(array $expected, ResponseInterface $response) {
+    static::recursiveKSort($expected);
+    $actual = $this->serializer->decode((string) $response->getBody(), static::$format);
+    static::recursiveKSort($actual);
+
+    $this->assertSame($expected, $actual);
+  }
+
+}
diff --git a/core/modules/rest/tests/src/Functional/ResourceTestBase.php b/core/modules/rest/tests/src/Functional/ResourceTestBase.php
index 10fa555c1e..d6f78fa559 100644
--- a/core/modules/rest/tests/src/Functional/ResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/ResourceTestBase.php
@@ -144,12 +144,12 @@ public function setUp() {
    * @param string[] $authentication
    *   The allowed authentication providers for this resource.
    */
-  protected function provisionResource($formats = [], $authentication = []) {
+  protected function provisionResource($formats = [], $authentication = [], array $methods = ['GET', 'POST', 'PATCH', 'DELETE']) {
     $this->resourceConfigStorage->create([
       'id' => static::$resourceConfigId,
       'granularity' => RestResourceConfigInterface::RESOURCE_GRANULARITY,
       'configuration' => [
-        'methods' => ['GET', 'POST', 'PATCH', 'DELETE'],
+        'methods' => $methods,
         'formats' => $formats,
         'authentication' => $authentication,
       ],
@@ -403,4 +403,25 @@ protected function decorateWithXdebugCookie(array $request_options) {
     return $request_options;
   }
 
+  /**
+   * Recursively sorts an array by key.
+   *
+   * @param array $array
+   *   An array to sort.
+   *
+   * @return array
+   *   The sorted array.
+   */
+  protected static function recursiveKSort(array &$array) {
+    // First, sort the main array.
+    ksort($array);
+
+    // Then check for child arrays.
+    foreach ($array as $key => &$value) {
+      if (is_array($value)) {
+        static::recursiveKSort($value);
+      }
+    }
+  }
+
 }
diff --git a/core/modules/rest/tests/src/Unit/EventSubscriber/ResourceResponseSubscriberTest.php b/core/modules/rest/tests/src/Unit/EventSubscriber/ResourceResponseSubscriberTest.php
index d09fdced4c..7ac71d3b67 100644
--- a/core/modules/rest/tests/src/Unit/EventSubscriber/ResourceResponseSubscriberTest.php
+++ b/core/modules/rest/tests/src/Unit/EventSubscriber/ResourceResponseSubscriberTest.php
@@ -78,7 +78,7 @@ public function providerTestSerialization() {
    *
    * @dataProvider providerTestResponseFormat
    */
-  public function testResponseFormat($methods, array $supported_formats, $request_format, array $request_headers, $request_body, $expected_response_format, $expected_response_content_type, $expected_response_content) {
+  public function testResponseFormat($methods, array $supported_formats, $request_format, array $request_headers, $request_body, $expected_response_format, $expected_response_content_type, $expected_response_content, array $supported_request_formats = []) {
     foreach ($request_headers as $key => $value) {
       unset($request_headers[$key]);
       $key = strtoupper(str_replace('-', '_', $key));
@@ -92,8 +92,10 @@ public function testResponseFormat($methods, array $supported_formats, $request_
       if ($request_format) {
         $request->setRequestFormat($request_format);
       }
-      $route_requirement_key_format = $request->isMethodCacheable() ? '_format' : '_content_type_format';
-      $route_match = new RouteMatch('test', new Route('/rest/test', ['_rest_resource_config' => $this->randomMachineName()], [$route_requirement_key_format => implode('|', $supported_formats)]));
+
+      $route_requirements = $this->generateRouteRequirements($request, $supported_formats, $supported_request_formats);
+
+      $route_match = new RouteMatch('test', new Route('/rest/test', ['_rest_resource_config' => $this->randomMachineName()], $route_requirements));
 
       $resource_response_subscriber = new ResourceResponseSubscriber(
         $this->prophesize(SerializerInterface::class)->reveal(),
@@ -113,9 +115,7 @@ public function testResponseFormat($methods, array $supported_formats, $request_
    *
    * @dataProvider providerTestResponseFormat
    */
-  public function testOnResponseWithCacheableResponse($methods, array $supported_formats, $request_format, array $request_headers, $request_body, $expected_response_format, $expected_response_content_type, $expected_response_content) {
-    $rest_config_name = $this->randomMachineName();
-
+  public function testOnResponseWithCacheableResponse($methods, array $supported_formats, $request_format, array $request_headers, $request_body, $expected_response_format, $expected_response_content_type, $expected_response_content, array $supported_request_formats = []) {
     foreach ($request_headers as $key => $value) {
       unset($request_headers[$key]);
       $key = strtoupper(str_replace('-', '_', $key));
@@ -129,8 +129,10 @@ public function testOnResponseWithCacheableResponse($methods, array $supported_f
       if ($request_format) {
         $request->setRequestFormat($request_format);
       }
-      $route_requirement_key_format = $request->isMethodCacheable() ? '_format' : '_content_type_format';
-      $route_match = new RouteMatch('test', new Route('/rest/test', ['_rest_resource_config' => $rest_config_name], [$route_requirement_key_format => implode('|', $supported_formats)]));
+
+      $route_requirements = $this->generateRouteRequirements($request, $supported_formats, $supported_request_formats);
+
+      $route_match = new RouteMatch('test', new Route('/rest/test', ['_rest_resource_config' => $this->randomMachineName()], $route_requirements));
 
       // The RequestHandler must return a ResourceResponseInterface object.
       $handler_response = new ResourceResponse($method !== 'DELETE' ? ['REST' => 'Drupal'] : NULL);
@@ -163,9 +165,7 @@ public function testOnResponseWithCacheableResponse($methods, array $supported_f
    *
    * @dataProvider providerTestResponseFormat
    */
-  public function testOnResponseWithUncacheableResponse($methods, array $supported_formats, $request_format, array $request_headers, $request_body, $expected_response_format, $expected_response_content_type, $expected_response_content) {
-    $rest_config_name = $this->randomMachineName();
-
+  public function testOnResponseWithUncacheableResponse($methods, array $supported_formats, $request_format, array $request_headers, $request_body, $expected_response_format, $expected_response_content_type, $expected_response_content, array $supported_request_formats = []) {
     foreach ($request_headers as $key => $value) {
       unset($request_headers[$key]);
       $key = strtoupper(str_replace('-', '_', $key));
@@ -179,8 +179,10 @@ public function testOnResponseWithUncacheableResponse($methods, array $supported
       if ($request_format) {
         $request->setRequestFormat($request_format);
       }
-      $route_requirement_key_format = $request->isMethodCacheable() ? '_format' : '_content_type_format';
-      $route_match = new RouteMatch('test', new Route('/rest/test', ['_rest_resource_config' => $rest_config_name], [$route_requirement_key_format => implode('|', $supported_formats)]));
+
+      $route_requirements = $this->generateRouteRequirements($request, $supported_formats, $supported_request_formats);
+
+      $route_match = new RouteMatch('test', new Route('/rest/test', ['_rest_resource_config' => $this->randomMachineName()], $route_requirements));
 
       // The RequestHandler must return a ResourceResponseInterface object.
       $handler_response = new ModifiedResourceResponse($method !== 'DELETE' ? ['REST' => 'Drupal'] : NULL);
@@ -308,6 +310,17 @@ public function providerTestResponseFormat() {
         'application/json',
         $json_encoded,
       ],
+      'unsafe methods with response (POST, PATCH): client requested format other than request body format when only XML is allowed as a content type format' => [
+        ['POST', 'PATCH'],
+        ['xml'],
+        'json',
+        ['Content-Type' => 'text/xml'],
+        $xml_encoded,
+        'json',
+        'application/json',
+        $json_encoded,
+        ['json'],
+      ],
     ];
 
     $unsafe_method_bodyless_test_cases = [
@@ -368,4 +381,40 @@ protected function getFunctioningResourceResponseSubscriber(RouteMatchInterface
     return $resource_response_subscriber;
   }
 
+  /**
+   * Generates route requirements based on supported formats.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The request object.
+   * @param array $supported_formats
+   *   The supported formats to generate requirements for.
+   *
+   * @return array
+   *   An array of route requirements.
+   */
+  protected function generateRouteRequirements(Request $request, array $supported_formats, array $supported_request_formats = []) {
+    // Add the supported formats as allowed response formats so requests can
+    // receive responses in a different format.
+    $supported_format_string = implode('|', $supported_formats);
+
+    // If there are supported request formats, use those. Otherwise, use the
+    // supported formats.
+    if ($supported_request_formats) {
+      $request_format_string = implode('|', $supported_request_formats);
+    }
+    else {
+      $request_format_string = $supported_format_string;
+    }
+
+    $route_requirements = [
+      '_format' => $request_format_string,
+    ];
+
+    if (!$request->isMethodCacheable()) {
+      $route_requirements['_content_type_format'] = $supported_format_string;
+    }
+
+    return $route_requirements;
+  }
+
 }
