diff --git a/src/Symfony/Component/ErrorHandler/ErrorRenderer/SerializerErrorRenderer.php b/src/Symfony/Component/ErrorHandler/ErrorRenderer/SerializerErrorRenderer.php
index cec8e4d413dce..4d1e752dc1ffe 100644
--- a/src/Symfony/Component/ErrorHandler/ErrorRenderer/SerializerErrorRenderer.php
+++ b/src/Symfony/Component/ErrorHandler/ErrorRenderer/SerializerErrorRenderer.php
@@ -55,7 +55,7 @@ public function __construct(SerializerInterface $serializer, $format, ErrorRende
*/
public function render(\Throwable $exception): FlattenException
{
- $headers = [];
+ $headers = ['Vary' => 'Accept'];
$debug = \is_bool($this->debug) ? $this->debug : ($this->debug)($exception);
if ($debug) {
$headers['X-Debug-Exception'] = rawurlencode($exception->getMessage());
@@ -66,19 +66,17 @@ public function render(\Throwable $exception): FlattenException
try {
$format = \is_string($this->format) ? $this->format : ($this->format)($flattenException);
- $headers = [
- 'Content-Type' => Request::getMimeTypes($format)[0] ?? $format,
- 'Vary' => 'Accept',
- ];
+ $headers['Content-Type'] = Request::getMimeTypes($format)[0] ?? $format;
- return $flattenException->setAsString($this->serializer->serialize($flattenException, $format, [
+ $flattenException->setAsString($this->serializer->serialize($flattenException, $format, [
'exception' => $exception,
'debug' => $debug,
- ]))
- ->setHeaders($flattenException->getHeaders() + $headers);
+ ]));
} catch (NotEncodableValueException $e) {
- return $this->fallbackErrorRenderer->render($exception);
+ $flattenException = $this->fallbackErrorRenderer->render($exception);
}
+
+ return $flattenException->setHeaders($flattenException->getHeaders() + $headers);
}
public static function getPreferredFormat(RequestStack $requestStack): \Closure
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