diff --git a/src/GlobalServerContext.php b/src/GlobalServerContext.php
new file mode 100644
index 00000000..57c97f43
--- /dev/null
+++ b/src/GlobalServerContext.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BEAR\QueryRepository;
+
+use Override;
+
+use function is_string;
+
+/**
+ * Server context implementation using $_SERVER superglobal
+ *
+ * This is the default implementation for traditional PHP-FPM environments
+ * where each request runs in isolation and $_SERVER is safe to use.
+ *
+ * For concurrent request processing (Swoole, RoadRunner), use a request-scoped
+ * implementation instead.
+ */
+final class GlobalServerContext implements ServerContextInterface
+{
+    #[Override]
+    public function get(string $key): string|null
+    {
+        if (! isset($_SERVER[$key])) {
+            return null;
+        }
+
+        /** @var mixed $value */
+        $value = $_SERVER[$key];
+
+        return is_string($value) ? $value : null;
+    }
+
+    #[Override]
+    public function has(string $key): bool
+    {
+        return isset($_SERVER[$key]);
+    }
+}
diff --git a/src/QueryRepositoryModule.php b/src/QueryRepositoryModule.php
index c9b38ec4..6065d9c7 100644
--- a/src/QueryRepositoryModule.php
+++ b/src/QueryRepositoryModule.php
@@ -69,6 +69,8 @@ protected function configure(): void
         $this->bind(RefreshAnnotatedCommand::class);
         $this->bind(RefreshSameCommand::class);
         $this->bind(ResourceStorageSaver::class);
+        // Server context for thread safety (Swoole, RoadRunner, etc.)
+        $this->bind(ServerContextInterface::class)->to(GlobalServerContext::class)->in(Scope::SINGLETON);
         // #[Cacheable]
         $this->install(new CacheableModule());
         // #[CacheableResponse]
diff --git a/src/RepositoryLogger.php b/src/RepositoryLogger.php
index 57dbea33..29be391e 100644
--- a/src/RepositoryLogger.php
+++ b/src/RepositoryLogger.php
@@ -28,6 +28,15 @@ public function log(string $operation, array $context = []): void
         $this->logs[] = ['op' => $operation, ...$context];
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    #[Override]
+    public function reset(): void
+    {
+        $this->logs = [];
+    }
+
     #[Override]
     public function __toString(): string
     {
diff --git a/src/RepositoryLoggerInterface.php b/src/RepositoryLoggerInterface.php
index 2668352a..c696bbff 100644
--- a/src/RepositoryLoggerInterface.php
+++ b/src/RepositoryLoggerInterface.php
@@ -9,5 +9,14 @@ interface RepositoryLoggerInterface
     /** @param array<string, mixed> $context */
     public function log(string $operation, array $context = []): void;
 
+    /**
+     * Reset the logger state
+     *
+     * This method clears all accumulated logs. It should be called at the end of
+     * each request in long-running environments (Swoole, RoadRunner) to prevent
+     * log accumulation across requests.
+     */
+    public function reset(): void;
+
     public function __toString(): string;
 }
diff --git a/src/ResourceStorage.php b/src/ResourceStorage.php
index b28bd5ad..a3d3b1da 100644
--- a/src/ResourceStorage.php
+++ b/src/ResourceStorage.php
@@ -21,9 +21,9 @@
 use function explode;
 use function implode;
 use function is_array;
-use function is_string;
 use function sprintf;
 use function strtoupper;
+use function trim;
 
 /**
  * @psalm-type Props = array{
@@ -32,7 +32,8 @@
  *     uriTag: UriTag,
  *     saver: ResourceStorageSaver,
  *     roProvider:ProviderInterface<TagAwareAdapterInterface>,
- *     etagProvider: ProviderInterface<TagAwareAdapterInterface>
+ *     etagProvider: ProviderInterface<TagAwareAdapterInterface>,
+ *     serverContext: ServerContextInterface
  * }
  */
 final class ResourceStorage implements ResourceStorageInterface
@@ -64,6 +65,7 @@ public function __construct(
         private PurgerInterface $purger,
         private UriTagInterface $uriTag,
         private ResourceStorageSaver $saver,
+        private ServerContextInterface $serverContext,
         #[Set(TagAwareAdapterInterface::class, ResourceObjectPool::class)]
         ProviderInterface $roPoolProvider,
         #[Set(TagAwareAdapterInterface::class, EtagPool::class)]
@@ -239,19 +241,26 @@ private function evaluateBody(mixed $body): mixed
 
     private function getUriKey(AbstractUri $uri, string $type): string
     {
-        return $type . ($this->uriTag)($uri) . (isset($_SERVER['X_VARY']) ? $this->getVary() : '');
+        return $type . ($this->uriTag)($uri) . ($this->serverContext->has('X_VARY') ? $this->getVary() : '');
     }
 
     private function getVary(): string
     {
-        $xvary = $_SERVER['X_VARY'];
-        /** @psalm-suppress RedundantCast */
-        $varys = explode(',', (string) $xvary); // @phpstan-ignore-line
+        $xvary = $this->serverContext->get('X_VARY');
+        assert($xvary !== null, 'getVary() is only called when X_VARY exists');
+
+        $varys = explode(',', $xvary);
         $varyString = '';
         foreach ($varys as $vary) {
+            $vary = trim($vary);
+            if ($vary === '') {
+                continue;
+            }
+
             $phpVaryKey = sprintf('X_%s', strtoupper($vary));
-            if (isset($_SERVER[$phpVaryKey]) && is_string($_SERVER[$phpVaryKey])) {
-                $varyString .= $_SERVER[$phpVaryKey];
+            $value = $this->serverContext->get($phpVaryKey);
+            if ($value !== null) {
+                $varyString .= $value;
             }
         }
 
@@ -279,6 +288,7 @@ public function __serialize(): array
             'saver' => $this->saver,
             'roProvider' => $this->roPoolProvider,
             'etagProvider' => $this->etagPoolProvider,
+            'serverContext' => $this->serverContext,
         ];
     }
 
@@ -293,6 +303,7 @@ public function __unserialize(array $data): void
         $this->purger = $data['purger'];
         $this->uriTag = $data['uriTag'];
         $this->saver = $data['saver'];
+        $this->serverContext = $data['serverContext'];
         $this->initializePools($data['roProvider'], $data['etagProvider']);
     }
 }
diff --git a/src/ServerContextInterface.php b/src/ServerContextInterface.php
new file mode 100644
index 00000000..2f27db55
--- /dev/null
+++ b/src/ServerContextInterface.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BEAR\QueryRepository;
+
+/**
+ * Provides access to server context in a thread-safe manner
+ *
+ * This interface abstracts access to request context (like $_SERVER) to support
+ * concurrent request processing in environments like Swoole, RoadRunner, and ReactPHP.
+ *
+ * For traditional PHP-FPM: Use GlobalServerContext (default)
+ * For Swoole/RoadRunner: Implement with request-scoped context
+ */
+interface ServerContextInterface
+{
+    /**
+     * Get a value from the server context
+     *
+     * @param string $key The key to retrieve (e.g., 'HTTP_USER_AGENT', 'X_VARY')
+     *
+     * @return string|null The value or null if not set
+     */
+    public function get(string $key): string|null;
+
+    /**
+     * Check if a key exists in the server context
+     *
+     * @param string $key The key to check
+     */
+    public function has(string $key): bool;
+}
diff --git a/tests/GetInterceptorTest.php b/tests/GetInterceptorTest.php
index 114d958d..d5038a5f 100644
--- a/tests/GetInterceptorTest.php
+++ b/tests/GetInterceptorTest.php
@@ -101,4 +101,15 @@ public function testHttpCacheVary(): void
 
         unset($_SERVER['X_VARY'], $_SERVER['X_VAL1'], $_SERVER['X_VAL2']);
     }
+
+    public function testHttpCacheVaryWithEmptySegment(): void
+    {
+        $_SERVER['X_VARY'] = 'val1, , val2';
+        $_SERVER['X_VAL1'] = '1';
+        $_SERVER['X_VAL2'] = '2';
+        $ro = $this->resource->get('app://self/etag');
+        $this->assertArrayNotHasKey('Age', $ro->headers);
+
+        unset($_SERVER['X_VARY'], $_SERVER['X_VAL1'], $_SERVER['X_VAL2']);
+    }
 }
diff --git a/tests/GlobalServerContextTest.php b/tests/GlobalServerContextTest.php
new file mode 100644
index 00000000..e02f90ae
--- /dev/null
+++ b/tests/GlobalServerContextTest.php
@@ -0,0 +1,91 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BEAR\QueryRepository;
+
+use PHPUnit\Framework\TestCase;
+
+use function array_key_exists;
+
+class GlobalServerContextTest extends TestCase
+{
+    private GlobalServerContext $context;
+
+    /** @var array<string, mixed> */
+    private array $originalServer = [];
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        // Save original values for keys we'll modify
+        foreach (['TEST_KEY', 'TEST_STRING', 'TEST_INT', 'HTTP_USER_AGENT', 'X_VARY'] as $key) {
+            if (array_key_exists($key, $_SERVER)) {
+                $this->originalServer[$key] = $_SERVER[$key];
+            }
+        }
+
+        $this->context = new GlobalServerContext();
+    }
+
+    protected function tearDown(): void
+    {
+        // Restore original values or unset if they didn't exist
+        foreach (['TEST_KEY', 'TEST_STRING', 'TEST_INT', 'HTTP_USER_AGENT', 'X_VARY'] as $key) {
+            if (array_key_exists($key, $this->originalServer)) {
+                $_SERVER[$key] = $this->originalServer[$key];
+            } else {
+                unset($_SERVER[$key]);
+            }
+        }
+
+        parent::tearDown();
+    }
+
+    public function testGetReturnsValue(): void
+    {
+        $_SERVER['TEST_KEY'] = 'test_value';
+
+        $this->assertSame('test_value', $this->context->get('TEST_KEY'));
+    }
+
+    public function testGetReturnsNullForNonExistentKey(): void
+    {
+        $this->assertNull($this->context->get('NON_EXISTENT_KEY'));
+    }
+
+    public function testGetReturnsNullForNonStringValue(): void
+    {
+        $_SERVER['TEST_INT'] = 123;
+
+        $this->assertNull($this->context->get('TEST_INT'));
+    }
+
+    public function testHasReturnsTrueForExistingKey(): void
+    {
+        $_SERVER['TEST_KEY'] = 'value';
+
+        $this->assertTrue($this->context->has('TEST_KEY'));
+    }
+
+    public function testHasReturnsFalseForNonExistentKey(): void
+    {
+        $this->assertFalse($this->context->has('NON_EXISTENT_KEY'));
+    }
+
+    public function testGetHttpUserAgent(): void
+    {
+        $userAgent = 'Mozilla/5.0 Test';
+        $_SERVER['HTTP_USER_AGENT'] = $userAgent;
+
+        $this->assertSame($userAgent, $this->context->get('HTTP_USER_AGENT'));
+    }
+
+    public function testGetXVary(): void
+    {
+        $_SERVER['X_VARY'] = 'val1,val2';
+
+        $this->assertSame('val1,val2', $this->context->get('X_VARY'));
+    }
+}
diff --git a/tests/RepositoryLoggerTest.php b/tests/RepositoryLoggerTest.php
index 76c79bda..69082b7f 100644
--- a/tests/RepositoryLoggerTest.php
+++ b/tests/RepositoryLoggerTest.php
@@ -65,4 +65,25 @@ public function testLogWithNullValue(): void
         $logger->log('save-donut', ['uri' => 'app://self/page', 'sMaxAge' => null]);
         $this->assertSame('{"op":"save-donut","uri":"app://self/page","sMaxAge":null}', (string) $logger);
     }
+
+    public function testReset(): void
+    {
+        $logger = new RepositoryLogger();
+        $logger->log('operation1', ['id' => 1]);
+        $logger->log('operation2', ['id' => 2]);
+        $this->assertNotEmpty((string) $logger);
+
+        $logger->reset();
+        $this->assertSame('', (string) $logger);
+    }
+
+    public function testResetAllowsNewLogs(): void
+    {
+        $logger = new RepositoryLogger();
+        $logger->log('old-operation');
+        $logger->reset();
+        $logger->log('new-operation');
+
+        $this->assertSame('{"op":"new-operation"}', (string) $logger);
+    }
 }
diff --git a/tests/ResourceRepositoryTest.php b/tests/ResourceRepositoryTest.php
index abc0a607..a121cf4f 100644
--- a/tests/ResourceRepositoryTest.php
+++ b/tests/ResourceRepositoryTest.php
@@ -44,6 +44,7 @@ public function get()
                 new NullPurger(),
                 new UriTag(),
                 new ResourceStorageSaver(),
+                new GlobalServerContext(),
                 $tagAwareAdapterProvider,
                 $tagAwareAdapterProvider,
             ),
@@ -106,6 +107,7 @@ public function get()
                 new NullPurger(),
                 new UriTag(),
                 new ResourceStorageSaver(),
+                new GlobalServerContext(),
                 $tagAwareAdapterProvider,
                 $tagAwareAdapterProvider,
             ),
diff --git a/tests/ResourceStorageTest.php b/tests/ResourceStorageTest.php
index 4ca68b9f..71854af0 100644
--- a/tests/ResourceStorageTest.php
+++ b/tests/ResourceStorageTest.php
@@ -35,6 +35,7 @@ public function get()
             new NullPurger(),
             new UriTag(),
             new ResourceStorageSaver(),
+            new GlobalServerContext(),
             $tagAwareAdapterProvider,
             $tagAwareAdapterProvider,
         );