Merge branch '2.8' into 3.0

* 2.8:
  [VarDumper] Fix dumping jsons casted as arrays
  PassConfig::getMergePass is not an array
  Revert "bug #19114 [HttpKernel] Dont close the reponse stream in debug (nicolas-grekas)"
  Fix the retrieval of the last username when using forwarding
  [Yaml] Fix PHPDoc of the Yaml class
  [HttpFoundation] Add OPTIONS and TRACE to the list of safe methods
  Update getAbsoluteUri() for query string uris

Request.php

@@ -1463,7 +1463,7 @@ public function isMethod($method)
      */
     public function isMethodSafe()
     {
-        return in_array($this->getMethod(), array('GET', 'HEAD'));
+        return in_array($this->getMethod(), array('GET', 'HEAD', 'OPTIONS', 'TRACE'));
     }
 
     /**

Response.php

@@ -373,6 +373,12 @@ public function send()
         $this->sendHeaders();
         $this->sendContent();
 
+        if (function_exists('fastcgi_finish_request')) {
+            fastcgi_finish_request();
+        } elseif ('cli' !== PHP_SAPI) {
+            static::closeOutputBuffers(0, true);
+        }
+
         return $this;
     }
 

Tests/RequestTest.php

@@ -1934,6 +1934,32 @@ public function getLongHostNames()
             array(str_repeat(':', 101)),
         );
     }
+
+    /**
+     * @dataProvider methodSafeProvider
+     */
+    public function testMethodSafe($method, $safe)
+    {
+        $request = new Request();
+        $request->setMethod($method);
+        $this->assertEquals($safe, $request->isMethodSafe());
+    }
+
+    public function methodSafeProvider()
+    {
+        return array(
+            array('HEAD', true),
+            array('GET', true),
+            array('POST', false),
+            array('PUT', false),
+            array('PATCH', false),
+            array('DELETE', false),
+            array('PURGE', false),
+            array('OPTIONS', true),
+            array('TRACE', true),
+            array('CONNECT', false),
+        );
+    }
 }
 
 class RequestContentProxy extends Request