diff --git a/src/Symfony/Component/HttpFoundation/HeaderUtils.php b/src/Symfony/Component/HttpFoundation/HeaderUtils.php
index 3456edace0dc1..110896e1776d1 100644
--- a/src/Symfony/Component/HttpFoundation/HeaderUtils.php
+++ b/src/Symfony/Component/HttpFoundation/HeaderUtils.php
@@ -286,7 +286,11 @@ private static function groupParts(array $matches, string $separators, bool $fir
}
foreach ($partMatches as $matches) {
- $parts[] = '' === $separators ? self::unquote($matches[0][0]) : self::groupParts($matches, $separators, false);
+ if ('' === $separators && '' !== $unquoted = self::unquote($matches[0][0])) {
+ $parts[] = $unquoted;
+ } elseif ($groupedParts = self::groupParts($matches, $separators, false)) {
+ $parts[] = $groupedParts;
+ }
}
return $parts;
diff --git a/src/Symfony/Component/HttpFoundation/Tests/AcceptHeaderTest.php b/src/Symfony/Component/HttpFoundation/Tests/AcceptHeaderTest.php
index bf4582430503e..e972d714e068a 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/AcceptHeaderTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/AcceptHeaderTest.php
@@ -41,6 +41,8 @@ public static function provideFromStringData()
{
return [
['', []],
+ [';;;', []],
+ ['0', [new AcceptHeaderItem('0')]],
['gzip', [new AcceptHeaderItem('gzip')]],
['gzip,deflate,sdch', [new AcceptHeaderItem('gzip'), new AcceptHeaderItem('deflate'), new AcceptHeaderItem('sdch')]],
["gzip, deflate\t,sdch", [new AcceptHeaderItem('gzip'), new AcceptHeaderItem('deflate'), new AcceptHeaderItem('sdch')]],
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