diff --git a/README.md b/README.md
index 82845b2..6d17a2b 100644
--- a/README.md
+++ b/README.md
@@ -131,6 +131,14 @@ To run the test suite, go to the project root and run:
 $ php vendor/bin/phpunit
 ```
 
+The test suite also contains a number of functional integration tests that send
+test HTTP requests against the online service http://httpbin.org and thus rely
+on a stable internet connection.
+If you do not want to run these, they can simply be skipped like this:
+
+```bash
+$ php vendor/bin/phpunit --exclude-group internet
+
 ## License
 
 MIT, see [LICENSE file](LICENSE).
diff --git a/composer.json b/composer.json
index aa0e86b..c6c7b7e 100644
--- a/composer.json
+++ b/composer.json
@@ -7,8 +7,8 @@
         "php": ">=5.4.0",
         "guzzlehttp/psr7": "^1.0",
         "react/event-loop": "^1.0 || ^0.5 || ^0.4 || ^0.3",
-        "react/socket": "^1.0 || ^0.8.2",
-        "react/stream": "^1.0 || ^0.7 || ^0.6 || ^0.5 || ^0.4.2",
+        "react/socket": "^1.0 || ^0.8.3",
+        "react/stream": "^1.0 || ^0.7.1",
         "react/promise": "~2.2",
         "evenement/evenement": "^3.0 || ^2.0"
     },
diff --git a/tests/FunctionalIntegrationTest.php b/tests/FunctionalIntegrationTest.php
index c59c8a4..cfa6800 100644
--- a/tests/FunctionalIntegrationTest.php
+++ b/tests/FunctionalIntegrationTest.php
@@ -46,6 +46,67 @@ public function testSuccessfulResponseEmitsEnd()
         $loop->run();
     }
 
+    /** @group internet */
+    public function testPostDataReturnsData()
+    {
+        $loop = Factory::create();
+        $client = new Client($loop);
+
+        $data = str_repeat('.', 33000);
+        $request = $client->request('POST', 'https://' . (mt_rand(0, 1) === 0 ? 'eu.' : '') . 'httpbin.org/post', array('Content-Length' => strlen($data)));
+
+        $buffer = '';
+        $request->on('response', function (Response $response) use (&$buffer) {
+            $response->on('data', function ($chunk) use (&$buffer) {
+                $buffer .= $chunk;
+            });
+        });
+
+        $request->on('error', 'printf');
+        $request->on('error', $this->expectCallableNever());
+
+        $request->end($data);
+
+        $loop->run();
+
+        $this->assertNotEquals('', $buffer);
+
+        $parsed = json_decode($buffer, true);
+        $this->assertTrue(is_array($parsed) && isset($parsed['data']));
+        $this->assertEquals(strlen($data), strlen($parsed['data']));
+        $this->assertEquals($data, $parsed['data']);
+    }
+
+    /** @group internet */
+    public function testPostJsonReturnsData()
+    {
+        $loop = Factory::create();
+        $client = new Client($loop);
+
+        $data = json_encode(array('numbers' => range(1, 50)));
+        $request = $client->request('POST', 'https://httpbin.org/post', array('Content-Length' => strlen($data), 'Content-Type' => 'application/json'));
+
+        $buffer = '';
+        $request->on('response', function (Response $response) use (&$buffer) {
+            $response->on('data', function ($chunk) use (&$buffer) {
+                $buffer .= $chunk;
+            });
+        });
+
+        $request->on('error', 'printf');
+        $request->on('error', $this->expectCallableNever());
+
+        $request->end($data);
+
+        $loop->run();
+
+        $this->assertNotEquals('', $buffer);
+
+        $parsed = json_decode($buffer, true);
+        $this->assertTrue(is_array($parsed) && isset($parsed['json']));
+        $this->assertEquals(json_decode($data, true), $parsed['json']);
+    }
+
     /** @group internet */
     public function testCancelPendingConnectionEmitsClose()
     {