symfony
diff --git a/‎src/Symfony/Component/HttpClient/CachingHttpClient.php
Lines changed: 7 additions & 2 deletions b/‎src/Symfony/Component/HttpClient/CachingHttpClient.php
Lines changed: 7 additions & 2 deletions
@@ -12,6 +12,7 @@
 namespace Symfony\Component\HttpClient;
 
 use Symfony\Component\Cache\Adapter\TagAwareAdapterInterface;
+use Symfony\Component\HttpClient\Chunk\ErrorChunk;
 use Symfony\Component\HttpClient\Exception\ChunkCacheItemNotFoundException;
 use Symfony\Component\HttpClient\Response\AsyncContext;
 use Symfony\Component\HttpClient\Response\AsyncResponse;
@@ -149,7 +150,7 @@ public function request(string $method, string $url, array $options = []): Respo
         // consistent expiration time for all items
         $expiresAt = null === $this->ttl
             ? null
-            : new \DateTimeImmutable("+{$this->ttl} seconds");
+            : \DateTimeImmutable::createFromFormat('U', time() + $this->ttl);
 
         return new AsyncResponse(
             $this->client,
@@ -173,13 +174,17 @@ function (ChunkInterface $chunk, AsyncContext $context) use (
             ): \Generator {
                 if (null !== $chunk->getError() || $chunk->isTimeout()) {
                     if ('stale-but-usable' === $freshness) {
+                        // avoid throwing exception in ErrorChunk#__destruct()
+                        $chunk instanceof ErrorChunk && $chunk->didThrow(true);
                         $context->passthru();
                         $context->replaceResponse($this->createResponseFromCache($metadataKey, $cachedData, $method, $url, $options));
 
                         return;
                     }
 
                     if ('must-revalidate' === $freshness) {
+                        // avoid throwing exception in ErrorChunk#__destruct()
+                        $chunk instanceof ErrorChunk && $chunk->didThrow(true);
                         $context->passthru();
                         $context->replaceResponse($this->createGatewayTimeoutResponse($method, $url, $options));
 
@@ -419,7 +424,7 @@ private function buildVariantKey(array $normalizedHeaders, array $varyFields): s
             } else {
                 $joined = \is_array($normalizedHeaders[$lower])
                     ? implode(',', $normalizedHeaders[$lower])
-                    : (string) $normalizedHeaders[$lower];
+                    : $normalizedHeaders[$lower];
                 $parts[] = $field.'='.rawurlencode($joined);
             }
         }