Added server request test against content headers.

Updated getServerRequestHeaders to be more efficient and accurate.
Wrong variable used in dependency injection documentation.

docs/source/dependency-injection.rst

@@ -14,7 +14,7 @@ Imaging we have a ``FooHandler`` that depends on a ``BarInterface``, and ``BazIn
         private $bar;
         private $baz;
 
-        public function __construct(BarInterface $bar, BazInterface $bar)
+        public function __construct(BarInterface $bar, BazInterface $baz)
         {
             $this->bar = $bar;
             $this->baz = $baz;

src/Message/ServerRequest.php

@@ -479,25 +479,28 @@ class ServerRequest extends Request implements ServerRequestInterface
      */
     protected function getServerRequestHeaders()
     {
-        if (!function_exists('apache_get_version'))  {
         // http://www.php.net/manual/en/function.getallheaders.php#84262
         $headers = array();
         foreach ($_SERVER as $name => $value) {
             if (substr($name, 0, 5) === "HTTP_") {
-                    $headers[str_replace(" ", "-", ucwords(strtolower(str_replace("_", " ", substr($name, 5)))))] = $value;
+                $name = $this->normalizeHeaderName(substr($name, 5));
+                $headers[$name] = $value;
+            } elseif ($name === "CONTENT_LENGTH" || $name === "CONTENT_TYPE") {
+                $name = $this->normalizeHeaderName($name);
+                $headers[$name] = $value;
             }
         }
         return $headers;
     }
-        else {
+
-            $headers = apache_request_headers();
+    /**
-            if (is_array($headers)) {
+     * @param string $name
-                return $headers;
+     * @return string
-            }
+     */
-            else {
+    private function normalizeHeaderName($name)
-                return array();
+    {
-            }
+        $name = ucwords(strtolower(str_replace("_", " ", $name)));
-        }
+        return str_replace(" ", "-", $name);
     }
 
     /**

test/tests/unit/Message/ServerRequestTest.php

@@ -121,6 +121,20 @@ class ServerRequestTest extends TestCase
         $this->assertEquals(["application/json"], $request->getHeader("Accept"));
     }
 
+    /**
+     * @backupGlobals enabled
+     */
+    public function testGetServerRequestReadsContentHeaders()
+    {
+        $_SERVER = [
+            "CONTENT_LENGTH" => "1024",
+            "CONTENT_TYPE" => "application/json"
+        ];
+        $request = ServerRequest::getServerRequest();
+        $this->assertEquals("1024", $request->getHeaderLine("Content-length"));
+        $this->assertEquals("application/json", $request->getHeaderLine("Content-type"));
+    }
+
     public function testGetServerRequestReadsBody()
     {
         $body = new NullStream();