.../rest/src/Plugin/rest/resource/EntityResource.php        | 13 +------------
 .../Functional/EntityResource/EntityResourceTestBase.php    |  9 ++++-----
 2 files changed, 5 insertions(+), 17 deletions(-)

diff --git a/core/modules/rest/src/Plugin/rest/resource/EntityResource.php b/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
index 834c2bb..612deff 100644
--- a/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
+++ b/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
@@ -394,9 +394,8 @@ protected function getBaseRoute($canonical_path, $method) {
    */
   public function availableMethods() {
     $methods = parent::availableMethods();
+    // Without validation, it's impossible to support creation or modification.
     if (!$this->entityType->get('supports_validation')) {
-      // Currently only GET is supported for Config Entities.
-      // @todo Remove when supported https://www.drupal.org/node/2300677
       $unsupported_methods = ['POST', 'PUT', 'DELETE', 'PATCH'];
       $methods = array_diff($methods, $unsupported_methods);
     }
@@ -404,16 +403,6 @@ public function availableMethods() {
   }
 
   /**
-   * Checks if this resource is for a Config Entity.
-   *
-   * @return bool
-   *   TRUE if the entity is a Config Entity, FALSE otherwise.
-   */
-  protected function isConfigEntityResource() {
-    return $this->entityType instanceof ConfigEntityType;
-  }
-
-  /**
    * {@inheritdoc}
    */
   public function calculateDependencies() {
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
index 5b22991..5e32a7e 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
@@ -631,7 +631,7 @@ protected static function castToString(array $normalization) {
   public function testPost() {
     // @todo Remove this in https://www.drupal.org/node/2300677.
     if (!$this->entity->getEntityType()->get('supports_validation')) {
-      $this->assertTrue(TRUE, "This entity type doesn't support posting.");
+      $this->assertTrue(TRUE, "This entity type doesn't support POSTing.");
       return;
     }
 
@@ -738,7 +738,6 @@ public function testPost() {
 
     // DX: 422 when invalid entity: multiple values sent for single-value field.
     $response = $this->request('POST', $url, $request_options);
-
     if ($this->entity instanceof ConfigEntityInterface) {
       $this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\nlabel: This value should be of the correct primitive type.\n", $response);
     }
@@ -748,6 +747,7 @@ public function testPost() {
       $this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\n$label_field: $label_field_capitalized: this field cannot hold more than 1 values.\n", $response);
     }
 
+
     $request_options[RequestOptions::BODY] = $parseable_invalid_request_body_2;
 
 
@@ -840,7 +840,7 @@ public function testPost() {
    */
   public function testPatch() {
     if (!$this->entity->getEntityType()->get('supports_validation')) {
-      $this->assertTrue(TRUE, "This entity type doesn't support patching.");
+      $this->assertTrue(TRUE, "This entity type doesn't support PATCHing.");
       return;
     }
 
@@ -1040,7 +1040,7 @@ public function testPatch() {
    */
   public function testDelete() {
     if (!$this->entity->getEntityType()->get('supports_validation')) {
-      $this->assertTrue(TRUE, "This entity type doesn't support deletion.");
+      $this->assertTrue(TRUE, "This entity type doesn't support DELETEing.");
       return;
     }
 
@@ -1213,7 +1213,6 @@ protected function getEntityResourcePostUrl() {
   protected function makeNormalizationInvalid(array $normalization) {
     // Add a second label to this entity to make it invalid.
     $label_field = $this->entity->getEntityType()->hasKey('label') ? $this->entity->getEntityType()->getKey('label') : static::$labelFieldName;
-
     if ($this->entity instanceof FieldableEntityInterface) {
       $normalization[$label_field][1]['value'] = 'Second Title';
     }