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+## Default operation
+
+Minify uses an algorithm to rewrite relative URIs in CSS output to root-relative URIs so that each link points to the same location it did in its original file.
+
+Say your style sheet `http://example.org/theme/fashion/style.css` contains:
+```
+body { background: url(bg.jpg); }
+```
+
+When Minify serves this content (from `http://example.org/min/f=theme/fashion/style.css` or `http://example.org/min/g=css`) it re-writes the URI so the image is correctly linked:
+```
+body{background:url(/theme/fashion/bg.jpg)}
+```
+
+You can see the steps used to rewrite your URIs by enabling [debug mode](Debugging.wiki.md).
+
+## Disable Rewriting
+
+You can disable the automatic rewriting by setting this in config.php:
+```php
+$min_serveOptions['rewriteCssUris'] = false;
+```
+
+## Manual Rewriting
+
+You can manually rewrite relative URIs in CSS in a couple ways. The simplest is to prepend a string to each relative URI:
+```php
+$min_serveOptions['rewriteCssUris'] = false;
+$min_serveOptions['minifierOptions'][Minify::TYPE_CSS]['prependRelativePath'] = '/css/';
+```
+
+Or you can run the minified output through a custom [post-processor](CookBook.wiki.md#Processing_Output_After_Minification.md) function.
+
+## Document Root Confusion
+
+Out-of-the-box, Minify gets confused when `min` is placed in a subdirectory of the real document root. There's now a [simple workaround](AlternateFileLayouts.md) for this, making `min` more portable.
+
+## Aliases / Symlinks / Virtual Directories
+
+Whether you use [aliases](http://httpd.apache.org/docs/2.2/mod/mod_alias.html), [symlinks](http://en.wikipedia.org/wiki/Symbolic_link), or [virtual directories](http://msdn.microsoft.com/en-us/library/zwk103ab.aspx), if you make content outside of the DOC\_ROOT available at public URLs, Minify may need manual configuration of the `$min_symlinks` option to rewrite some URIs correctly. Consider this scenario, where `http://example.org/static/style.css` will serve `/etc/static_content/style.css`:
+
+| document root     | `/var/www`                                  |
+|:------------------|:--------------------------------------------|
+| Apache mod\_alias | `Alias /static /etc/static_content`         |
+| ...or symlink     | `ln -s /etc/static_content /var/www/static` |
+
+In `/config.php` you'll need the following:
+```php
+// map URL path to file path
+$min_symlinks = array(
+    '//static' => '/etc/static_content'
+);
+```
+This lets Minify know during the rewriting process that an internal file path starting with `/etc/static_content` should be rewritten as a public URI beginning with `/static`.
+
+If your alias target directory is outside of DOC\_ROOT, you'll also need to explicitly allow Minify to serve files from it:
+```php
+$min_serveOptions['minApp']['allowDirs'] = array(
+    '//',                 // allow from the normal DOC_ROOT
+    '/etc/static_content' // allow from our alias target
+); 
+```
+
+### What's my document root?
+
+You can enable the script `min/server-info.php` and open http://example.org/min/server-info.php to find useful `$_SERVER` values. People in the [Google Group](https://groups.google.com/forum/#!forum/minify) might need these to help you.
+
+## It's still not working
+
+  1. Make sure you have the latest version.
+  1. Enable [debug mode](Debugging.wiki.md), which will show you the URI transformation process.
+  1. Check that `$_SERVER['DOCUMENT_ROOT']` is the correct directory path. If not, URI rewriting will fail. If you cannot fix this in httpd.conf, etc., set `$min_documentRoot` in config.php.
+  1. Paste your [debug mode](Debugging.wiki.md) comment block into a new post on the [minify mailing list](http://groups.google.com/group/minify).