diff --git a/src/swoole/src/SymfonyHttpBridge.php b/src/swoole/src/SymfonyHttpBridge.php
index ca26c2e..8479099 100644
--- a/src/swoole/src/SymfonyHttpBridge.php
+++ b/src/swoole/src/SymfonyHttpBridge.php
@@ -5,7 +5,6 @@
 use Swoole\Http\Request;
 use Swoole\Http\Response;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
-use Symfony\Component\HttpFoundation\HeaderBag;
 use Symfony\Component\HttpFoundation\Request as SymfonyRequest;
 use Symfony\Component\HttpFoundation\Response as SymfonyResponse;
 use Symfony\Component\HttpFoundation\StreamedResponse;
@@ -21,18 +20,15 @@ final class SymfonyHttpBridge
 {
     public static function convertSwooleRequest(Request $request): SymfonyRequest
     {
-        $sfRequest = new SymfonyRequest(
+        return new SymfonyRequest(
             $request->get ?? [],
             $request->post ?? [],
             [],
             $request->cookie ?? [],
             $request->files ?? [],
-            array_change_key_case($request->server ?? [], CASE_UPPER),
+            self::buildServer($request),
             $request->rawContent()
         );
-        $sfRequest->headers = new HeaderBag($request->header ?? []);
-
-        return $sfRequest;
     }
 
     public static function reflectSymfonyResponse(SymfonyResponse $sfResponse, Response $response): void
@@ -62,4 +58,25 @@ public static function reflectSymfonyResponse(SymfonyResponse $sfResponse, Respo
                 $response->end($sfResponse->getContent());
         }
     }
+
+    /**
+     * We must add the headers to the server otherwise they will not be available in sub-requests
+     */
+    private static function buildServer(Request $request): array
+    {
+        $serverHeaders = [];
+        /** Inspired by https://github.com/symfony/symfony/blob/85366b4767b1761f40701f4ea6692d5280e0d58d/src/Symfony/Component/HttpFoundation/Request.php#L546-L553 */
+        foreach ($request->header ?? [] as $name => $value) {
+            $name = strtoupper(str_replace('-', '_', $name));
+            if (false === in_array($name, ['CONTENT_TYPE', 'CONTENT_LENGTH', 'CONTENT_MD5'])) {
+                $name = sprintf('HTTP_%s', $name);
+            }
+            $serverHeaders[$name] = $value;
+        }
+
+        return array_merge(
+            array_change_key_case($request->server ?? [], CASE_UPPER),
+            $serverHeaders
+        );
+    }
 }
diff --git a/src/swoole/tests/Unit/SymfonyHttpBridgeTest.php b/src/swoole/tests/Unit/SymfonyHttpBridgeTest.php
index b2ef8da..7d73680 100644
--- a/src/swoole/tests/Unit/SymfonyHttpBridgeTest.php
+++ b/src/swoole/tests/Unit/SymfonyHttpBridgeTest.php
@@ -23,7 +23,7 @@ public function testThatSwooleRequestIsConverted(): void
     {
         $request = $this->createMock(Request::class);
         $request->server = ['request_method' => 'post'];
-        $request->header = ['content-type' => 'application/json'];
+        $request->header = ['content-type' => 'application/json', 'x-upstream-use' => 'swoole', 'http-upstream' => 'swoole'];
         $request->cookie = ['foo' => 'cookie'];
         $request->get = ['foo' => 'get'];
         $request->post = ['foo' => 'post'];
@@ -40,8 +40,17 @@ public function testThatSwooleRequestIsConverted(): void
 
         $sfRequest = SymfonyHttpBridge::convertSwooleRequest($request);
 
-        $this->assertSame(['REQUEST_METHOD' => 'post'], $sfRequest->server->all());
-        $this->assertSame(['content-type' => ['application/json']], $sfRequest->headers->all());
+        $this->assertSame([
+            'REQUEST_METHOD' => 'post',
+            'CONTENT_TYPE' => 'application/json',
+            'HTTP_X_UPSTREAM_USE' => 'swoole',
+            'HTTP_HTTP_UPSTREAM' => 'swoole',
+        ], $sfRequest->server->all());
+        $this->assertSame([
+            'content-type' => ['application/json'],
+            'x-upstream-use' => ['swoole'],
+            'http-upstream' => ['swoole'],
+        ], $sfRequest->headers->all());
         $this->assertSame(['foo' => 'cookie'], $sfRequest->cookies->all());
         $this->assertSame(['foo' => 'get'], $sfRequest->query->all());
         $this->assertSame(['foo' => 'post'], $sfRequest->request->all());
@@ -148,4 +157,40 @@ public function testStreamedResponseWillRespondWithOneChunkAtATime(): void
 
         SymfonyHttpBridge::reflectSymfonyResponse($sfResponse, $response);
     }
+
+    public function testThatSubRequestGetsParentRequestHeaders(): void
+    {
+        $request = $this->createMock(Request::class);
+        $request->server = ['request_method' => 'post'];
+        $request->header = ['host' => 'example.com', 'content-type' => 'application/json', 'x-upstream-use' => 'swoole', 'http-upstream' => 'swoole'];
+        $request->cookie = ['foo' => 'cookie'];
+        $request->get = ['foo' => 'get'];
+        $request->post = ['foo' => 'post'];
+        $request->files = [
+            'foo' => [
+                'name' => 'file',
+                'type' => 'image/png',
+                'tmp_name' => '/tmp/file',
+                'error' => UPLOAD_ERR_CANT_WRITE,
+                'size' => 0,
+            ],
+        ];
+
+        $sfRequest = SymfonyHttpBridge::convertSwooleRequest($request);
+
+        // Simulating creating sub-request
+        $sfSubRequest = SymfonyRequest::create(
+            '/some-url',
+            'get',
+            [],
+            $sfRequest->cookies->all(),
+            [],
+            $sfRequest->server->all()
+        );
+
+        $this->assertSame('example.com', $sfSubRequest->headers->get('host'));
+        $this->assertSame('application/json', $sfSubRequest->headers->get('content-type'));
+        $this->assertSame('swoole', $sfSubRequest->headers->get('x-upstream-use'));
+        $this->assertSame('swoole', $sfSubRequest->headers->get('http-upstream'));
+    }
 }