diff --git a/core/core.services.yml b/core/core.services.yml
index 3f68677200..0bbc0b7dc6 100644
--- a/core/core.services.yml
+++ b/core/core.services.yml
@@ -972,6 +972,11 @@ services:
     tags:
       - { name: paramconverter }
     arguments: ['@entity.manager', '@language_manager']
+  paramconverter.simple_config:
+    class: Drupal\Core\ParamConverter\SimpleConfigConverter
+    tags:
+      - { name: paramconverter }
+    arguments: ['@config.factory']
   paramconverter.entity_revision:
     class: Drupal\Core\ParamConverter\EntityRevisionParamConverter
     tags:
diff --git a/core/lib/Drupal/Core/ParamConverter/SimpleConfigConverter.php b/core/lib/Drupal/Core/ParamConverter/SimpleConfigConverter.php
new file mode 100644
index 0000000000..46ad05881b
--- /dev/null
+++ b/core/lib/Drupal/Core/ParamConverter/SimpleConfigConverter.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace Drupal\Core\ParamConverter;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Converts simple configuration.
+ */
+class SimpleConfigConverter implements ParamConverterInterface {
+
+  /**
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * SimpleConfigConverter constructor.
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $configFactory
+   */
+  public function __construct(ConfigFactoryInterface $configFactory) {
+    $this->configFactory = $configFactory;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function convert($value, $definition, $name, array $defaults) {
+    return $this->configFactory->get($definition['simple_config']);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function applies($definition, $name, Route $route) {
+    return !empty($definition['simple_config']);
+  }
+
+}
diff --git a/core/modules/rest/src/Plugin/Deriver/SimpleConfigDeriver.php b/core/modules/rest/src/Plugin/Deriver/SimpleConfigDeriver.php
index 93892965c4..00e6e71f4b 100644
--- a/core/modules/rest/src/Plugin/Deriver/SimpleConfigDeriver.php
+++ b/core/modules/rest/src/Plugin/Deriver/SimpleConfigDeriver.php
@@ -69,17 +69,21 @@ public function getDerivativeDefinitions($base_plugin_definition) {
     });
 
     foreach ($simple_config_schemas as $name => $simple_config_schema) {
-      $this->derivatives[$name] = [
-        'id' => 'config:' . $name,
+      $this->derivatives[str_replace('.', '_', $name)] = [
+        'id' => 'config_' . str_replace('.', '_', $name),
         'config_name' => $name,
         'serialization_class' => '@fixme',
         'label' => isset($simple_config_schema['label']) ? $simple_config_schema['label'] : 'Config: ' . $name,
-      ];
+      ] + $base_plugin_definition;
     }
+
     return $this->derivatives;
   }
 
   protected function isConfigSchema(array $schema, array $all_schemas) {
+    if (empty($schema['type'])) {
+      return FALSE;
+    }
     if ($schema['type'] === 'config_object') {
       return TRUE;
     }
diff --git a/core/modules/rest/src/Plugin/Type/ResourcePluginManager.php b/core/modules/rest/src/Plugin/Type/ResourcePluginManager.php
index 4dd9ca2d4e..a51120e6e0 100644
--- a/core/modules/rest/src/Plugin/Type/ResourcePluginManager.php
+++ b/core/modules/rest/src/Plugin/Type/ResourcePluginManager.php
@@ -30,7 +30,7 @@ class ResourcePluginManager extends DefaultPluginManager {
   public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
     parent::__construct('Plugin/rest/resource', $namespaces, $module_handler, 'Drupal\rest\Plugin\ResourceInterface', 'Drupal\rest\Annotation\RestResource');
 
-    $this->setCacheBackend($cache_backend, 'rest_plugins');
+//    $this->setCacheBackend($cache_backend, 'rest_plugins');
     $this->alterInfo('rest_resource');
   }
 
diff --git a/core/modules/rest/src/Plugin/rest/resource/SimpleConfigResource.php b/core/modules/rest/src/Plugin/rest/resource/SimpleConfigResource.php
index 1bac4f2627..ef4cabbfda 100644
--- a/core/modules/rest/src/Plugin/rest/resource/SimpleConfigResource.php
+++ b/core/modules/rest/src/Plugin/rest/resource/SimpleConfigResource.php
@@ -68,7 +68,6 @@ class SimpleConfigResource extends ResourceBase implements DependentPluginInterf
    */
   public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityTypeManagerInterface $entity_type_manager, $serializer_formats, LoggerInterface $logger, ConfigFactoryInterface $config_factory, PluginManagerInterface $link_relation_type_manager) {
     parent::__construct($configuration, $plugin_id, $plugin_definition, $serializer_formats, $logger);
-    $this->entityType = $entity_type_manager->getDefinition($plugin_definition['entity_type']);
     $this->configFactory = $config_factory;
     $this->linkRelationTypeManager = $link_relation_type_manager;
   }
@@ -105,47 +104,6 @@ public function get(StorableConfigBase $config) {
     return $response;
   }
 
-  /**
-   * Responds toconfig PATCH requests.
-   *
-   * @param \Drupal\Core\Config\StorableConfigBase $original_config
-   *   The original config object.
-   * @param \Drupal\Core\Config\StorableConfigBase $config
-   *   The config.
-   *
-   * @return \Drupal\rest\ModifiedResourceResponse
-   *   The HTTP response object.
-   *
-   * @throws \Symfony\Component\HttpKernel\Exception\HttpException
-   */
-  public function patch(StorableConfigBase $original_config, StorableConfigBase $config = NULL) {
-    if ($config == NULL) {
-      throw new BadRequestHttpException('No config received.');
-    }
-    $definition = $this->getPluginDefinition();
-    if ($config->getName() !== $definition['config_name']) {
-      throw new BadRequestHttpException('Invalid config');
-    }
-    // @fixme access checking?
-
-    // Overwrite the received fields.
-//    foreach ($entity->_restSubmittedFields as $field_name) {
-//    }
-
-    // @fixme validation?
-
-    try {
-      $config->save(TRUE);
-      $this->logger->notice('Updated config %name', ['%name' => $config->getName()]);
-
-      // Return the updated entity in the response body.
-      return new ModifiedResourceResponse($config, 200);
-    }
-    catch (StorageException $e) {
-      throw new HttpException(500, 'Internal Server Error', $e);
-    }
-  }
-
   /**
    * {@inheritdoc}
    */
@@ -168,7 +126,7 @@ protected function getBaseRoute($canonical_path, $method) {
 
     $parameters = $route->getOption('parameters') ?: [];
     // @todo Add a config param converter?
-    $parameters[$definition['config_name']]['type'] = 'config:' . $definition['config_name'];
+    $parameters['simple_config']['simple_config'] = $definition['config_name'];
     $route->setOption('parameters', $parameters);
 
     return $route;
@@ -178,10 +136,14 @@ protected function getBaseRoute($canonical_path, $method) {
    * {@inheritdoc}
    */
   public function availableMethods() {
-    $methods = parent::availableMethods();
-    $unsupported_methods = ['POST', 'PUT', 'DELETE'];
-    $methods = array_diff($methods, $unsupported_methods);
-    return $methods;
+    return ['GET'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function calculateDependencies() {
+    return [];
   }
 
 }
diff --git a/core/modules/serialization/serialization.services.yml b/core/modules/serialization/serialization.services.yml
index dca6094787..0d7f6464d8 100644
--- a/core/modules/serialization/serialization.services.yml
+++ b/core/modules/serialization/serialization.services.yml
@@ -7,6 +7,11 @@ services:
     tags:
       - { name: normalizer }
     arguments: ['@entity.manager']
+  serializer.normalizer.simple_config:
+      class: Drupal\serialization\Normalizer\SimpleConfigNormalizer
+      tags:
+        - { name: normalizer }
+      arguments: ['@entity.manager']
   serializer.normalizer.content_entity:
       class: Drupal\serialization\Normalizer\ContentEntityNormalizer
       tags:
diff --git a/core/modules/serialization/src/Normalizer/SimpleConfigNormalizer.php b/core/modules/serialization/src/Normalizer/SimpleConfigNormalizer.php
new file mode 100644
index 0000000000..b047174b46
--- /dev/null
+++ b/core/modules/serialization/src/Normalizer/SimpleConfigNormalizer.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Drupal\serialization\Normalizer;
+
+use Symfony\Component\Serializer\Exception\CircularReferenceException;
+use Symfony\Component\Serializer\Exception\InvalidArgumentException;
+use Symfony\Component\Serializer\Exception\LogicException;
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+
+class SimpleConfigNormalizer extends NormalizerBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $supportedInterfaceOrClass = '\Drupal\Core\Config\StorableConfigBase';
+
+  /**
+   * {@inheritdoc}
+   */
+  public function normalize($object, $format = NULL, array $context = array()) {
+    /** @var \Drupal\Core\Config\StorableConfigBase $object */
+    return $object->get();
+  }
+
+}