diff --git a/src/Connection/Http2Connection.php b/src/Connection/Http2Connection.php
index 2c3727c..70aad5c 100644
--- a/src/Connection/Http2Connection.php
+++ b/src/Connection/Http2Connection.php
@@ -10,7 +10,9 @@ use NoccyLabs\React\Http2\Frame\HeadersFrame;
 use NoccyLabs\React\Http2\Frame\SettingsFrame;
 use NoccyLabs\React\Http2\Stream\Http2Stream;
 use Psr\Http\Message\ServerRequestInterface;
+use React\Stream\CompositeStream;
 use React\Stream\DuplexStreamInterface;
+use React\Stream\ThroughStream;
 
 /**
  * HTTP/2 Connecton Classs
@@ -23,10 +25,11 @@ class Http2Connection implements EventEmitterInterface
 
     /** @var string Emitted when a new stream is opened */
     const EVENT_OPEN = 'open';
-
     /** @var string Emitted when a the connection (and effectively all its streams) are closed */
     const EVENT_CLOSE = 'close';
 
+    const EVENT_ERROR = 'error';
+
     /** @var array<int,Http2Stream> The active streams, even for s2c, odd for c2s */
     private array $streams = [];
 
@@ -36,16 +39,29 @@ class Http2Connection implements EventEmitterInterface
     /** @var int Max number of streams that can be opened; assigned from settings frame */
     private int $maxStream = 0;
 
+    private ServerRequestInterface $request;
+
     /** @var DuplexStreamInterface The connection to the client */
     private DuplexStreamInterface $connection;
 
+    private DuplexStreamInterface $responseStream;
+
+    private ?SettingsFrame $settings = null;
+
     private string $buffer = '';
 
-    public function __construct(DuplexStreamInterface $connection, ServerRequestInterface $request, ?SettingsFrame $http2settings)
+    public function __construct(ServerRequestInterface $request, ?SettingsFrame $http2Settings)
     {
-        $this->connection = $connection;
+        $this->request = $request;
+        $this->settings = $http2Settings;
 
-        $connection->on('data', function ($data) {
+        $responseInputStream = new ThroughStream();
+        $responseOutputStream = new ThroughStream();
+
+        $this->responseStream = new CompositeStream($responseOutputStream, $responseInputStream);
+        $this->connection = new CompositeStream($responseInputStream, $responseOutputStream);
+
+        $this->connection->on('data', function ($data) {
             $this->buffer .= $data;
             $frame = Frame::parseFrame($this->buffer);
             $this->handleHttp2Frame($frame);
@@ -85,7 +101,15 @@ class Http2Connection implements EventEmitterInterface
 
     }
 
-    
+    /**
+     * Create a pair of streams, one for incoming and one for outgoing data.
+     *
+     * @return Http2Stream[]
+     */
+    private function createStreamPair(): array
+    {
+
+    }
 
     /**
      * When a new stream is opened, clean up older streams that are idle or closed.
@@ -96,4 +120,9 @@ class Http2Connection implements EventEmitterInterface
     {
 
     }
+
+    public function getResponseStream(): DuplexStreamInterface
+    {
+        return $this->responseStream;
+    }
 }
\ No newline at end of file
diff --git a/src/Http2Middleware.php b/src/Http2Middleware.php
index e68ca9f..647a6f8 100644
--- a/src/Http2Middleware.php
+++ b/src/Http2Middleware.php
@@ -22,16 +22,20 @@ class Http2Middleware
     /** @var SplObjectStorage<Http2Connection> Active connections */
     private SplObjectStorage $connections;
 
-    public function __construct()
+    private array $handlers;
+
+    public function __construct(callable ...$httpHandlers)
     {
+        $this->handlers = $httpHandlers;
         $this->connections = new SplObjectStorage();
     }
 
     public function __invoke(ServerRequestInterface $request, ?callable $next=null)
     {
         // expect upgrade h2 for secure connections, h2c for plaintext
-
         $requestSecure = $request->getHeaderLine("x-forwarded-proto") ?: "http";
+
+        // Parse out headers
         $requestUpgrade = $request->getHeaderLine("upgrade");
         $connectionFlags = array_map(
             fn($v) => strtolower(trim($v)), 
@@ -45,28 +49,19 @@ class Http2Middleware
             return Response::plaintext("Unsupported protocol")->withStatus(Response::STATUS_BAD_REQUEST);
         }
 
-        // handle HTTP/2 upgrade from HTTP/1.1
-        $http2SettingsData = $request->getHeaderLine("http2-settings");
-        if ($http2SettingsData) {
-            $http2Settings = $this->parseSettingsFromBase64String($http2SettingsData);
-        } else {
-            // TODO handle HTTP/2 with prior knowledge
-            return Response::plaintext("Expected HTTP2-Settings header")->withStatus(Response::STATUS_BAD_REQUEST);
+        try {
+            $connection = $this->setupConnection($request);
+        }
+        catch (\Exception $e) {
+            return Response::plaintext("Error upgrading connection")->withStatus(Response::STATUS_BAD_REQUEST);
         }
-
-        $responseInputStream = new ThroughStream();
-        $responseOutputStream = new ThroughStream();
-        $responseStream = new CompositeStream($responseOutputStream, $responseInputStream);
-        $serverStream = new CompositeStream($responseInputStream, $responseOutputStream);
-
-        $connection = new Http2Connection($serverStream, $request, $http2Settings??null);
 
         $headers = [
             'Connection' => 'Upgrade',
             'Upgrade' => $requestUpgrade
         ];
 
-        return (new Response(Response::STATUS_SWITCHING_PROTOCOLS, $headers, $responseStream));
+        return (new Response(Response::STATUS_SWITCHING_PROTOCOLS, $headers, $connection->getResponseStream()));
 
     }
 
@@ -93,8 +88,19 @@ class Http2Middleware
      */
     private function setupConnection(ServerRequestInterface $request): Http2Connection
     {
-        $stream = new ThroughStream();
-        $connection = new Http2Connection($stream);
+        // handle HTTP/2 upgrade from HTTP/1.1
+        $hasSettingsHeader = str_contains("http2-settings", strtolower($request->getHeaderLine("connection")));
+        
+        $http2Settings = null;
+        if ($hasSettingsHeader) {
+            $http2SettingsData = $request->getHeaderLine("http2-settings");
+            if (!$http2SettingsData) {
+                throw new \RuntimeException("Expected HTTP2-Settings header");
+            }
+            $http2Settings = $this->parseSettingsFromBase64String($http2SettingsData);
+        }
+
+        $connection = new Http2Connection($request, $http2Settings??null);
 
         $this->connections->attach($connection);
         $connection->on('close', function () use ($connection) {
diff --git a/tests/Connection/Http2ConnectionTest.php b/tests/Connection/Http2ConnectionTest.php
new file mode 100644
index 0000000..ee22a72
--- /dev/null
+++ b/tests/Connection/Http2ConnectionTest.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace NoccyLabs\React\Http2\Connection;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+
+#[CoversClass(Http2Connection::class)]
+class Http2ConnectionTest extends \PHPUnit\Framework\TestCase
+{
+
+}
\ No newline at end of file
diff --git a/tests/Http2MiddlewareTest.php b/tests/Http2MiddlewareTest.php
index 4be6f6a..d77b179 100644
--- a/tests/Http2MiddlewareTest.php
+++ b/tests/Http2MiddlewareTest.php
@@ -14,17 +14,30 @@ class Http2MiddlewareTest extends \PHPUnit\Framework\TestCase
 
     public function testInvalidUpgradeRequests()
     {
+        $middleware = new Http2Middleware();
+
         $request = new ServerRequest("GET", "/", [
             "Upgrade" => "h2",
             "x-forwarded-proto" => "http"
         ]);
 
-        $middleware = new Http2Middleware();
+        /** @var ResponseInterface $response */
+        $response = $middleware($request);
+
+        $this->assertEquals(Response::STATUS_BAD_REQUEST, $response->getStatusCode());
+        $this->assertEquals("Unsupported protocol", $response->getBody());
+
+        $request = new ServerRequest("GET", "/", [
+            "Upgrade" => "h2c",
+            "x-forwarded-proto" => "http",
+        ]);
 
         /** @var ResponseInterface $response */
         $response = $middleware($request);
 
         $this->assertEquals(Response::STATUS_BAD_REQUEST, $response->getStatusCode());
+        $this->assertEquals("Unsupported protocol", $response->getBody());
+
     }
 
     public function testHandlingUpgradeRequest()