silverstripe-framework/docs/en/reference/urlvariabletools.md
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# URL Variable Tools
## Introduction
This page lists a number of "page options" , "rendering tools" or "special URL variables" that you can use to debug your
SilverStripe applications. These are consumed in PHP using the $_REQUEST or $_GET superglobals throughout the SilverStripe
core.
**General Usage**
Append the option and corresponding value to your URL in your browser's address bar. You may find the [Firefox UrlParams extension](https://addons.mozilla.org/en-US/firefox/addon/1290) useful in order to debug a POST requests (Like Forms).
http://yoursite.com/page?option_name=value
http://yoursite.com/page?option_1=value&option_2=value
## Templates
| URL Variable | | Values | | Description |
| ------------ | | ------ | | ----------- |
| flush | | 1,all | | This will clear out all cached information about the page. This is used frequently during development - for example, when adding new PHP or SS files. See below for value descriptions. |
| showtemplate | | 1 | | Show the compiled version of all the templates used, including line numbers. Good when you have a syntax error in a template. Cannot be used on a Live site without **isDev**. **flush** can be used with the following values: |
| ?flush=1 | | | | Flushes the current page and included templates |
| ?flush=all | | | | Flushes the entire template cache |
## General Testing
| URL Variable | | Values | | Description |
| ------------ | | ------ | | ----------- |
| isDev | | 1 | | Put the site into [development mode](/topics/debugging), enabling debugging messages to the browser on a live server. For security, you'll be asked to log in with an administrator log-in. Will persist for the current browser session. |
| isTest | | 1 | | See above. |
| debug | | 1 | | Show a collection of debugging information about the director / controller operation |
| debug_request | | 1 | | Show all steps of the request from initial `[api:HTTPRequest]` to `[api:Controller]` to Template Rendering |
## Classes and Objects
| URL Variable | | Values | | Description |
| ------------ | | ------ | | ----------- |
| debugmethods | | 1 | | Shows all methods available when an object is constructed (useful when extending classes or using object extensions) |
| debugfailover | | 1 | | Shows failover methods from classes extended |
## Database
| URL Variable | | Values | | Description |
| ------------ | | ------ | | ----------- |
| showqueries | | 1 | | List all SQL queries executed |
| previewwrite | | 1 | | List all insert / update SQL queries, and **don't** execute them. Useful for previewing writes to the database. |
## Security Redirects
You can set an URL to redirect back to after a [Security](/topics/security) action. See the section on [URL
Redirections](security#redirect_back_to_another_page_after_login) for more information and examples.
| URL Variable | | Values | | Description |
| ------------ | | ------ | | ----------- |
| BackURL | | URL | | Set to a relative URL string to use once Security Action is complete |
## Building and Publishing URLS
| Site URL | | Action |
| -------- | | ------ |
| http://yoursite.com**/dev/build** | | Rebuild the entire database and manifest, see below for additional URL Variables |
| http://yoursite.com**/admin/publishall/** | | Publish all pages on the site |
| http://yoursite.com**/anypage/images/flush** | | Creates new images for the page by deleting the resized ones and going back to the original to create new resized one |
### /dev/build
| URL Variable | | Values | | Description |
| ------------ | | ------ | | ----------- |
| quiet | | 1 | | Don't show messages during build |
| dont_populate | | 1 | | Don't run **requireDefaultRecords()** on the models when building. This will build the table but not insert any records |