jsonapi.services.yml    |  2 +-
 src/EntityToJsonApi.php | 16 +++++++++++++---
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/jsonapi.services.yml b/jsonapi.services.yml
index 0dc5f88..0fd7814 100644
--- a/jsonapi.services.yml
+++ b/jsonapi.services.yml
@@ -131,7 +131,7 @@ services:
 
   jsonapi.entity.to_jsonapi:
     class: Drupal\jsonapi\EntityToJsonApi
-    arguments: ['@http_kernel']
+    arguments: ['@http_kernel', '@request_stack']
 
   logger.channel.jsonapi:
     parent: logger.channel_base
diff --git a/src/EntityToJsonApi.php b/src/EntityToJsonApi.php
index f54fbab..6bed824 100644
--- a/src/EntityToJsonApi.php
+++ b/src/EntityToJsonApi.php
@@ -5,6 +5,7 @@ namespace Drupal\jsonapi;
 use Drupal\Component\Serialization\Json;
 use Drupal\Core\Entity\EntityInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 
 /**
@@ -22,13 +23,21 @@ class EntityToJsonApi {
   protected $httpKernel;
 
   /**
+   * The request stack.
+   *
+   * @var \Symfony\Component\HttpFoundation\RequestStack
+   */
+  protected $requestStack;
+
+  /**
    * EntityToJsonApi constructor.
    *
    * @param \Symfony\Component\HttpKernel\HttpKernelInterface
    *   The HTTP kernel.
    */
-  public function __construct(HttpKernelInterface $http_kernel) {
+  public function __construct(HttpKernelInterface $http_kernel, RequestStack $request_stack) {
     $this->httpKernel = $http_kernel;
+    $this->requestStack = $request_stack;
   }
 
   /**
@@ -41,8 +50,9 @@ class EntityToJsonApi {
    *   The raw JSON string of the requested resource.
    */
   public function serialize(EntityInterface $entity) {
-    $path = sprintf('/jsonapi/%s/%s/%s', $entity->getEntityTypeId(), $entity->bundle(), $entity->uuid());
-    $request = Request::create($path, 'GET', ['_format' => 'api_json']);
+    $master_request = $this->requestStack->getMasterRequest();
+    $path = sprintf('%s/jsonapi/%s/%s/%s', $master_request->getBasePath(), $entity->getEntityTypeId(), $entity->bundle(), $entity->uuid());
+    $request = Request::create($path, 'GET', ['_format' => 'api_json'], $master_request->cookies->all(), [], $master_request->server->all());
     $response = $this->httpKernel->handle($request, HttpKernelInterface::SUB_REQUEST, TRUE);
     return $response->getContent();
   }