diff --git a/composer.json b/composer.json
index 5204335..ebad855 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,8 @@
         "zendframework/zend-diactoros": "^1.1.3"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8.6"
+        "phpunit/phpunit": "^4.8.6",
+        "mikey179/vfsStream": "^1.6"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/PhpDebugBarMiddleware.php b/src/PhpDebugBarMiddleware.php
index c05232f..e774dcb 100644
--- a/src/PhpDebugBarMiddleware.php
+++ b/src/PhpDebugBarMiddleware.php
@@ -6,8 +6,11 @@
 use Psr\Http\Message\MessageInterface;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\UriInterface;
+use Zend\Diactoros\Response;
 use Zend\Diactoros\Response\HtmlResponse;
 use Zend\Diactoros\Response\Serializer;
+use Zend\Diactoros\Stream;
 
 /**
  * PhpDebugBarMiddleware
@@ -38,6 +41,10 @@ public function __construct(DebugBarRenderer $debugbarRenderer)
      */
     public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next)
     {
+        if ($staticFile = $this->getStaticFile($request->getUri())) {
+            return $staticFile;
+        }
+
         $outResponse = $next($request, $response);
 
         if (!$this->isHtmlAccepted($request)) {
@@ -65,6 +72,59 @@ public function __invoke(ServerRequestInterface $request, ResponseInterface $res
         return new HtmlResponse($result);
     }
 
+    /**
+     * @param UriInterface $uri
+     *
+     * @return ResponseInterface|null
+     */
+    private function getStaticFile(UriInterface $uri)
+    {
+        if (strpos($uri->getPath(), $this->debugBarRenderer->getBaseUrl()) !== 0) {
+            return;
+        }
+
+        $pathToFile = substr($uri->getPath(), strlen($this->debugBarRenderer->getBaseUrl()));
+
+        $fullPathToFile = $this->debugBarRenderer->getBasePath() . $pathToFile;
+
+        if (!file_exists($fullPathToFile)) {
+            return;
+        }
+
+        $stream = new Stream($fullPathToFile, 'r');
+        $staticResponse = new Response($stream);
+        $contentType = $this->getContentTypeByFileName($fullPathToFile);
+
+        return $staticResponse->withHeader('Content-type', $contentType);
+    }
+
+    /**
+     * @param string $filename
+     *
+     * @return string
+     */
+    private function getContentTypeByFileName($filename)
+    {
+        $ext = pathinfo($filename, PATHINFO_EXTENSION);
+
+        $map = [
+            'css' => 'text/css',
+            'js' => 'text/javascript',
+            'otf' => 'font/opentype',
+            'eot' => 'application/vnd.ms-fontobject',
+            'svg' => 'image/svg+xml',
+            'ttf' => 'application/font-sfnt',
+            'woff' => 'application/font-woff',
+            'woff2' => 'application/font-woff2',
+        ];
+
+        if (isset($map[$ext])) {
+            return $map[$ext];
+        }
+
+        return 'text/plain';
+    }
+
     /**
      * @param ResponseInterface $response
      *
diff --git a/test/PhpDebugBarMiddlewareTest.php b/test/PhpDebugBarMiddlewareTest.php
index 1f6766c..f474d81 100644
--- a/test/PhpDebugBarMiddlewareTest.php
+++ b/test/PhpDebugBarMiddlewareTest.php
@@ -3,16 +3,19 @@
 namespace PhpMiddlewareTest\PhpDebugBar;
 
 use DebugBar\JavascriptRenderer;
+use org\bovigo\vfs\vfsStream;
 use PhpMiddleware\PhpDebugBar\PhpDebugBarMiddleware;
+use PHPUnit_Framework_TestCase;
 use Zend\Diactoros\Response;
 use Zend\Diactoros\ServerRequest;
+use Zend\Diactoros\Uri;
 
 /**
  * PhpDebugBarMiddlewareTest
  *
  * @author Witold Wasiczko <witold@wasiczko.pl>
  */
-class PhpDebugBarMiddlewareTest extends \PHPUnit_Framework_TestCase
+class PhpDebugBarMiddlewareTest extends PHPUnit_Framework_TestCase
 {
     protected $debugbarRenderer;
     protected $middleware;
@@ -101,4 +104,61 @@ public function testAppendsToEndOfHtmlResponse()
         $this->assertSame($response, $result);
         $this->assertSame($html . 'RenderHeadRenderBody', (string) $result->getBody());
     }
+
+    public function testTryToHandleNotExistingStaticFile()
+    {
+        $this->debugbarRenderer->expects($this->any())->method('getBaseUrl')->willReturn('/phpdebugbar');
+
+        $uri = new Uri('http://example.com/phpdebugbar/boo.css');
+        $request = new ServerRequest([], [], $uri, null, 'php://memory');
+        $response = new Response\HtmlResponse('<html></html>');
+
+        $calledOut = false;
+        $outFunction = function ($request, $response) use (&$calledOut) {
+            $calledOut = true;
+            return $response;
+        };
+
+        $result = call_user_func($this->middleware, $request, $response, $outFunction);
+        $this->assertTrue($calledOut, 'Out is not called');
+        $this->assertSame($response, $result);
+    }
+
+    /**
+     * @dataProvider getContentTypes
+     */
+    public function testHandleStaticFile($extension, $contentType)
+    {
+        $root = vfsStream::setup('boo');
+
+        $this->debugbarRenderer->expects($this->any())->method('getBaseUrl')->willReturn('/phpdebugbar');
+        $this->debugbarRenderer->expects($this->any())->method('getBasePath')->willReturn(vfsStream::url('boo'));
+
+        $uri = new Uri(sprintf('http://example.com/phpdebugbar/debugbar.%s', $extension));
+        $request = new ServerRequest([], [], $uri, null, 'php://memory');
+        $response = new Response\HtmlResponse('<html></html>');
+
+        vfsStream::newFile(sprintf('debugbar.%s', $extension))->withContent('filecontent')->at($root);
+
+        $calledOut = false;
+        $outFunction = function ($request, $response) use (&$calledOut) {
+            $calledOut = true;
+            return $response;
+        };
+
+        $result = call_user_func($this->middleware, $request, $response, $outFunction);
+        $this->assertFalse($calledOut, 'Out is called');
+        $this->assertNotSame($response, $result);
+        $this->assertSame($contentType, $result->getHeaderLine('Content-type'));
+        $this->assertSame('filecontent', (string) $result->getBody());
+    }
+
+    public function getContentTypes()
+    {
+        return [
+            ['css', 'text/css'],
+            ['js', 'text/javascript'],
+            ['html', 'text/plain'],
+        ];
+    }
 }