diff --git a/src/FetchWebResource.php b/src/FetchWebResource.php
index 35c15b8..39d86e8 100644
--- a/src/FetchWebResource.php
+++ b/src/FetchWebResource.php
@@ -84,19 +84,17 @@ class FetchWebResource {
     if (!isset($schema_uri)) {
       $schema_uri = static::SCHEMA_URI;
     }
-    $options['headers'] = [
-      'Accept' => $accept_header,
-      'Accept-Charset' => 'UTF-8, *'
-    ];
-    $request = new Request('GET', $url, $options);
+    // Create a new GET request.
+    $request = (new Request('GET', $url))
+      ->withHeader('Accept', $accept_header)
+      ->withHeader('Accept-Charset', 'UTF-8, *');
+    // Get request headers.
+    $request_headers = $request->getHeaders();
+    // Get a http client.
     $http_client = $this->httpClientFactory->fromOptions();
     try {
       // Send an HTTP request and get a response.
       $response = $http_client->send($request);
-      // Get request headers.
-      foreach (array_merge($options['headers'], $http_client->getConfig('headers')) as $key => $value) {
-        $request_headers[$key] = [$value];
-      }
     }
     catch (RequestException $re) {
       if ($re->hasResponse()) {