diff --git a/src/Headers.php b/src/Headers.php
index 8240a28..9d8c299 100644
--- a/src/Headers.php
+++ b/src/Headers.php
@@ -53,7 +53,7 @@ public static function createFromGlobals(array $globals)
             $key = strtoupper($key);
             if (isset(static::$special[$key]) || strpos($key, 'HTTP_') === 0) {
                 if ($key !== 'HTTP_CONTENT_LENGTH') {
-                    $data[$key] =  $value;
+                    $data[self::reconstructOriginalKey($key)] =  $value;
                 }
             }
         }
@@ -216,4 +216,25 @@ public function normalizeKey($key)
 
         return $key;
     }
+
+    /**
+     * Reconstruct original header name
+     *
+     * This method takes an HTTP header name from the Environment
+     * and returns it as it was probably formatted by the actual client.
+     *
+     * @param string $key An HTTP header key from the $_SERVER global variable
+     *
+     * @return string The reconstructed key
+     *
+     * @example CONTENT_TYPE => Content-Type
+     * @example HTTP_USER_AGENT => User-Agent
+     */
+    private static function reconstructOriginalKey($key)
+    {
+        if (strpos($key, 'HTTP_') === 0) {
+            $key = substr($key, 5);
+        }
+        return strtr(ucwords(strtr(strtolower($key), '_', ' ')), ' ', '-');
+    }
 }
diff --git a/tests/HeadersTest.php b/tests/HeadersTest.php
index 6a5d041..c21771d 100644
--- a/tests/HeadersTest.php
+++ b/tests/HeadersTest.php
@@ -26,6 +26,7 @@ public function testCreateFromGlobals()
 
         $this->assertTrue(is_array($prop->getValue($h)['accept']));
         $this->assertEquals('application/json', $prop->getValue($h)['accept']['value'][0]);
+        $this->assertEquals('Accept', $prop->getValue($h)['accept']['originalKey']);
     }
 
     public function testCreateFromGlobalsWithSpecialHeaders()
@@ -39,6 +40,7 @@ public function testCreateFromGlobalsWithSpecialHeaders()
 
         $this->assertTrue(is_array($prop->getValue($h)['content-type']));
         $this->assertEquals('application/json', $prop->getValue($h)['content-type']['value'][0]);
+        $this->assertEquals('Content-Type', $prop->getValue($h)['content-type']['originalKey']);
     }
 
     public function testCreateFromGlobalsIgnoresHeaders()
@@ -52,6 +54,7 @@ public function testCreateFromGlobalsIgnoresHeaders()
         $prop->setAccessible(true);
 
         $this->assertNotContains('content-length', $prop->getValue($h));
+        $this->assertEquals('Content-Type', $prop->getValue($h)['content-type']['originalKey']);
     }
 
     public function testConstructor()