Removed ErrorPage

Removed references to ErrorPage so it can be split off in to a separate module. (#4149)

docs/en/01_Tutorials/01_Building_A_Basic_Site.md

@@ -71,7 +71,7 @@ should see the CMS interface with a list of the pages currently on your website
 
 ### Try it
 
-There are three pages already created for you - "Home", "About Us" and "Contact Us", as well as a 404 error page. Experiment
+There are three pages already created for you - "Home", "About Us" and "Contact Us". Experiment
 with the editor - try different formatting, tables and images. When you are done, click "Save Draft" or "Save
 & Publish" to post the content to the live site. 
 

docs/en/04_Changelogs/4.0.0.md

@@ -883,46 +883,9 @@ public function augmentSQL(SQLSelect $query, DataQuery $dataQuery = null)
 }
 ```
 
-#### Upgrade code that modifies the behaviour of ErrorPage
+#### Install the ErrorPage module
 
-ErrorPage has been updated to use a configurable asset backend, similar to the `AssetStore` described above.
-This replaces the `ErrorPage.static_filepath` config that was used to write local files.
-
-As a result, error pages may be cached either to a local filesystem, or an external Flysystem store
-(which is configured via setting a new Flysystem backend with YAML).
-
-`ErrorPage::get_filepath_for_errorcode()` has been removed, because the local path for a specific code is
-no longer assumed. Instead you should use `ErrorPage::get_content_for_errorcode` which retrieves the
-appropriate content for that error using one of the methods above.
-
-In order to retrieve the actual filename (which is used to identify an error page regardless of base
-path), you can use `ErrorPage::get_error_filename()` instead. Unlike the old `get_filepath_for_errorcode`
-method, there is no $locale parameter.
-
-In case that user code must customise this filename, such as for extensions which provide a locale value
-for any error page, the extension point `updateErrorFilename` can be used. This extension point should
-also be used to replace any `alternateFilepathForErrorcode` used.
-
-```php
-class MyErrorPageExtension extends SiteTreeExtension
-{
-	public function updateErrorFilename(&$name, &$statuscode)
-    {
-		if ($this->owner->exists()) {
-			$locale = $this->Locale;
-		} else {
-			$locale = Translatable::get_current_locale();
-		}
-		$name = "error-{$statusCode}-{$locale}.html";
-	}
-}
-```
-
-```yml
-ErrorPage:
-  extensions:
-    - MyErrorPageExtension
-```
+ErrorPage has been moved to a separate module to allow for alternative approaches to managing error responses. Please install [silverstripe/errorpage](http://addons.silverstripe.org/add-ons/silverstripe/errorpage) to preserve the 3.x functionality.
 
 #### Upgrading asset web.config, .htaccess, or other server configuration
 
@@ -1420,9 +1383,7 @@ After (`mysite/_config/config.yml`):
 * Removed `SapphireTest::skipTest()`, use `markTestSkipped()` in a `setUp()` method instead
 * Removed the `History.js` javascript library.
 * `debugmethods` querystring argument has been removed from debugging.
-* `ErrorPage.static_filepath` config has been removed.
-* `ErrorPage::get_filepath_for_errorcode` has been removed
-* `ErrorPage::alternateFilepathForErrorcode` extension point has been removed
+* Moved `ErrorPage` into a new module: [silverstripe/errorpage](http://addons.silverstripe.org/add-ons/silverstripe/errorpage). See upgrading notes in that module.
 * Removed `VirtualPage_Controller`. Virtual pages will now share whichever controller the “target” page uses
 * Removed `Config_LRU`
 * Removed `SilverStripeInjectionCreator`

tests/php/Control/RequestHandlingTest.php

@@ -3,7 +3,7 @@
 namespace SilverStripe\Control\Tests;
 
 use SilverStripe\Admin\LeftAndMain;
-use SilverStripe\CMS\Controllers\ErrorPageControllerExtension;
+use SilverStripe\ErrorPage\ErrorPageControllerExtension;
 use SilverStripe\Control\Controller;
 use SilverStripe\Control\Tests\RequestHandlingTest\AllowedController;
 use SilverStripe\Control\Tests\RequestHandlingTest\ControllerFormWithAllowedActions;