silverstripe-framework/docs/en/reference/director.md

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# Director
## Introduction
Director is the first step in the "execution pipeline". It parses the URL, matching it to one of a number of patterns,
and determines the controller, action and any argument to be used. It then runs the controller, which will finally run
the viewer and/or perform processing steps.
## Best Practices
* Checking for an Ajax-Request: Use Director::is_ajax() instead of checking for $_REQUEST['ajax'].
## Redirection
The Director class has a number of methods to facilitate 301 and 302 HTTP redirection.
* **Director::redirect("action-name")**: If there's no slash in the URL passed to redirect, then it is assumed that you
want to go to a different action on the current controller.
* **Director::redirect("relative/url")**: If there is a slash in the URL, it's taken to be a normal URL. Relative URLs
will are assumed to be relative to the site-root; so Director::redirect("home/") will work no matter what the current
URL is.
* **Director::redirect("http://www.absoluteurl.com")**: Of course, you can pass redirect() absolute URL s too.
* **Director::redirectPerm("any-url")**: redirectPerm takes the same arguments as redirect, but it will send a 301
(permanent) instead of a 302 (temporary) header. It improves search rankings, so this should be used whenever the
following two conditions are true:
* Nothing happens server-side prior to the redirection
* The redirection will always occur
* **Director::redirectBack()**: This will return you to the previous page. There's no permanent version of
redirectBack().
## Custom Rewrite Rules
You can influence the way URLs are resolved one of 2 ways
1. Adding rules to Director in `<yourproject>/_config.php` (See Default Rewrite Rules below for examples)
2. Adding rules in your extended Controller class via the *$url_handlers* static variable
See [controller](/topics/controller) for examples and explanations on how the rules get processed for both 1 and 2 above.
* Static redirect for specific URL
:::php
Director::addRules(100, array(
'myPermanentRedirect' => 'redirect:http://www.mysite.com'
));
## Default Rewrite Rules
SilverStripe comes with certain rewrite rules (e.g. for *admin/assets*).
* [sapphire/_config.php](http://open.silverstripe.org/browser/modules/sapphire/trunk/_config.php)
* [cms/_config.php](http://open.silverstripe.org/browser/modules/cms/trunk/_config.php)
## Links
* See ModelAsController class for details on controller/model-coupling
* See [execution-pipeline](/reference/execution-pipeline) for custom routing
## API Documentation
`[api:Director]`