Add shortcut method for empty responses

src/Response/EmptyResponse.php

@@ -0,0 +1,42 @@
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @see       http://github.com/zendframework/zend-diactoros for the canonical source repository
+ * @copyright Copyright (c) 2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   https://github.com/zendframework/zend-diactoros/blob/master/LICENSE.md New BSD License
+ */
+
+namespace Zend\Diactoros\Response;
+
+use Zend\Diactoros\Response;
+use Zend\Diactoros\Stream;
+
+/**
+ * A class representing empty HTTP responses.
+ */
+class EmptyResponse extends Response
+{
+    /**
+     * Create an empty response with the given status code.
+     *
+     * @param int $status Status code for the response, if any.
+     * @param array $headers Headers for the response, if any.
+     */
+    public function __construct($status = 204, array $headers = [])
+    {
+        $body = new Stream('php://temp', 'r');
+        parent::__construct($body, $status, $headers);
+    }
+
+    /**
+     * Create an empty response with the given headers.
+     *
+     * @param array $headers Headers for the response.
+     * @return EmptyResponse
+     */
+    public static function withHeaders(array $headers)
+    {
+        return new static(204, $headers);
+    }
+}

src/Response/StringResponse.php

@@ -71,7 +71,7 @@ private function __construct()
      * Create a Response from the provided information.
      *
      * Creates a Response using a php://temp stream, and writes the provided
-     * body to the stream; if non content-type header was provided, the given
+     * body to the stream; if no content-type header was provided, the given
      * $contentType is injected for it.
      *
      * @param string $body
@@ -85,7 +85,7 @@ private static function createResponse($body, $status, array $headers, $contentT
         $response = new Response('php://temp', $status, $headers);
         $response->getBody()->write($body);
 
-        if ($response->hasHeader('content-type')) {
+        if (empty($contentType) || $response->hasHeader('content-type')) {
             return $response;
         }
 

test/Response/EmptyResponseTest.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @see       http://github.com/zendframework/zend-diactoros for the canonical source repository
+ * @copyright Copyright (c) 2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   https://github.com/zendframework/zend-diactoros/blob/master/LICENSE.md New BSD License
+ */
+
+namespace ZendTest\Diactoros\Response;
+
+use PHPUnit_Framework_TestCase as TestCase;
+use Zend\Diactoros\Response\EmptyResponse;
+
+class EmptyResponseTest extends TestCase
+{
+    public function testConstructor()
+    {
+        $response = new EmptyResponse(201);
+        $this->assertInstanceOf('Zend\Diactoros\Response', $response);
+        $this->assertEquals('', (string) $response->getBody());
+        $this->assertEquals(201, $response->getStatusCode());
+    }
+
+    public function testHeaderConstructor()
+    {
+        $response = EmptyResponse::withHeaders(['x-empty' => ['true']]);
+        $this->assertInstanceOf('Zend\Diactoros\Response', $response);
+        $this->assertEquals('', (string) $response->getBody());
+        $this->assertEquals(204, $response->getStatusCode());
+        $this->assertEquals('true', $response->getHeaderLine('x-empty'));
+    }
+}