diff --git a/src/Application.php b/src/Application.php
index cd80fe40..4b6e6805 100644
--- a/src/Application.php
+++ b/src/Application.php
@@ -41,30 +41,35 @@ public function run()
 
         list($request, $response) = $this->components->getHttp();
 
-        $route = $this->getRoute($request);
+        $result = $this->getResponse($request);
 
-        if ($route instanceof ResponseInterface) {
-            $response = $route;
+        if ($result instanceof ResponseInterface) {
+            $response = $result;
         }
 
-        // Sets the HTTP response code.
-        http_response_code($response->getStatusCode());
-
         // Gets the selected route and sets it as the content.
         if ( ! $response->getBody() || $response->getBody() == '') {
-            $response->getBody()->write($route);
+            $response->getBody()->write($result);
+        }
+
+        // Sets the specified headers, if any.
+        foreach ($response->getHeaders() as $name => $value) {
+            header($name . ': ' . implode(',', $value));
         }
 
+        // Sets the HTTP response code.
+        http_response_code($response->getStatusCode());
+
         echo $response->getBody();
     }
 
     /**
-     * Gets the route result from the dispatcher.
+     * Gets the response from the dispatcher.
      * 
      * @param  \Psr\Http\Message\RequestInterface $request
-     * @return string
+     * @return mixed
      */
-    private function getRoute(RequestInterface $request)
+    private function getResponse(RequestInterface $request)
     {
         // Gets the requested route
         $route = $this->components->getDispatcher()->dispatch(
diff --git a/tests/ApplicationTest.php b/tests/ApplicationTest.php
index 337df648..09b44b05 100644
--- a/tests/ApplicationTest.php
+++ b/tests/ApplicationTest.php
@@ -118,12 +118,13 @@ public function testRunMethod()
 
         $application = new Application($this->components);
 
-        echo $application->run();
+        $application->run();
     }
 
     /**
      * Tests the run() method with a response as result.
      * 
+     * @runInSeparateProcess
      * @return void
      */
     public function testRunMethodWithResponse()
@@ -134,7 +135,7 @@ public function testRunMethodWithResponse()
 
         $application = new Application($this->components);
 
-        echo $application->run();
+        $application->run();
     }
 
     /**
@@ -150,7 +151,7 @@ public function testRunMethodWithCallback()
 
         $application = new Application($this->components);
 
-        echo $application->run();
+        $application->run();
     }
 
     /**
diff --git a/tests/Fixture/TestClassWithResponseInterface.php b/tests/Fixture/TestClassWithResponseInterface.php
index 3f3afdea..f26fccf8 100644
--- a/tests/Fixture/TestClassWithResponseInterface.php
+++ b/tests/Fixture/TestClassWithResponseInterface.php
@@ -27,8 +27,13 @@ public function __construct(ResponseInterface $response)
 
     public function index()
     {
-        $this->response->getBody()->write('Hello');
+        $response = $this->response
+            ->withStatus(200)
+            ->withHeader('Content-Type', 'application/json')
+            ->withHeader('Access-Control-Allow-Credentials', 'true');
 
-        return $this->response;
+        $response->getBody()->write('Hello');
+
+        return $response;
     }
 }