NEW Accept / as designation for root URL controller

src/Control/HTTPRequest.php

@@ -521,8 +521,8 @@ class HTTPRequest implements ArrayAccess
             $pattern = $matches[2];
         }
 
-        // Special case for the root URL controller
+        // Special case for the root URL controller (designated as an empty string, or a slash)
-        if (!$pattern) {
+        if (!$pattern || $pattern === '/') {
             return ($this->dirParts == array()) ? array('Matched' => true) : false;
         }
 

tests/php/Control/ControllerTest.php

@@ -14,6 +14,7 @@ use SilverStripe\Control\Tests\ControllerTest\IndexSecuredController;
 use SilverStripe\Control\Tests\ControllerTest\SubController;
 use SilverStripe\Control\Tests\ControllerTest\TestController;
 use SilverStripe\Control\Tests\ControllerTest\UnsecuredController;
+use SilverStripe\Control\Tests\RequestHandlingTest\HTTPMethodTestController;
 use SilverStripe\Dev\FunctionalTest;
 use SilverStripe\Security\Member;
 use SilverStripe\View\SSViewer;
@@ -34,6 +35,7 @@ class ControllerTest extends FunctionalTest
         ContainerController::class,
         HasAction::class,
         HasAction_Unsecured::class,
+        HTTPMethodTestController::class,
         IndexSecuredController::class,
         SubController::class,
         TestController::class,
@@ -493,4 +495,15 @@ class ControllerTest extends FunctionalTest
         $response = $this->get('ContainerController/subcontroller/substring/subvieweraction');
         $this->assertEquals('Hope this works', $response->getBody());
     }
+
+    public function testSpecificHTTPMethods()
+    {
+        // 'GET /'
+        $response = $this->get('HTTPMethodTestController');
+        $this->assertEquals('Routed to getRoot', $response->getBody());
+
+        // 'POST ' (legacy method of specifying root route)
+        $response = $this->post('HTTPMethodTestController', ['dummy' => 'example']);
+        $this->assertEquals('Routed to postLegacyRoot', $response->getBody());
+    }
 }

tests/php/Control/RequestHandlingTest/HTTPMethodTestController.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace SilverStripe\Control\Tests\RequestHandlingTest;
+
+use SilverStripe\Control\Controller;
+use SilverStripe\Control\HTTPRequest;
+use SilverStripe\Dev\TestOnly;
+
+class HTTPMethodTestController extends Controller implements TestOnly
+{
+    private static $url_segment = 'HTTPMethodTestController';
+
+    private static $url_handlers = [
+        'GET /' => 'getRoot',
+        'POST ' => 'postLegacyRoot',
+    ];
+
+    private static $allowed_actions = [
+        'getRoot',
+        'postLegacyRoot',
+    ];
+
+    public function getRoot(HTTPRequest $request)
+    {
+        return "Routed to getRoot";
+    }
+
+    public function postLegacyRoot(HTTPRequest $request)
+    {
+        return "Routed to postLegacyRoot";
+    }
+}

tests/php/Control/RequestHandlingTest/TestFormHandler.php

@@ -13,8 +13,8 @@ class TestFormHandler extends FormRequestHandler
 {
     private static $url_handlers = array(
         'fields/$FieldName' => 'handleField',
-        "POST " => "handleSubmission",
+        "POST /" => "handleSubmission",
-        "GET " => "handleGet",
+        "GET /" => "handleGet",
     );
 
     // These are a different case from those in url_handlers to confirm that it's all case-insensitive