also handle lowercase headers

lib/public/appframework/controller.php

@@ -80,7 +80,7 @@ abstract class Controller {
 
 		// return the first matching responder
 		foreach ($headers as $header) {
-            $header = trim($header);
+			$header = strtolower(trim($header));
 
 			$responder = str_replace('application/', '', $header);
 

tests/lib/appframework/controller/ControllerTest.php

@@ -185,4 +185,13 @@ class ControllerTest extends \PHPUnit_Framework_TestCase {
 	}
 
 
+	public function testResponderAcceptHeaderParsedUpperCase() {
+		$responder = $this->controller->getResponderByHTTPHeader(
+			'*/*, apPlication/ToM, application/json'
+		);
+
+		$this->assertEquals('tom', $responder);
+	}
+
+
 }