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The right approach depends on whether you need a temporary per-directory routing rule, a front-controller application, or a real filesystem-root change. The examples below show where the file goes, which Apache settings are required, how to avoid rewrite loops, and how to diagnose a rule that appears to do nothing.
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What an .htaccess file can and cannot change
DocumentRoot is a server and virtual-host setting. It tells Apache which filesystem directory represents the URL root for a host. Apache reads that directive from the main configuration or a <VirtualHost> block; it is not an .htaccess directive.
An .htaccess file is processed in a directory after Apache has selected the host and its configured document root. Its job is to apply per-directory overrides, including URL rewriting when mod_rewrite is enabled. A rewrite can make a request for / or /play fetch a file from a subdirectory such as /var/www/site/app, but that does not make /var/www/site/app the server’s actual document root.
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This distinction matters for relative paths, access rules, aliases, logging, and any other virtual host that uses the same root. Apache’s own guidance is that, when all content has really moved into a new directory, changing DocumentRoot or moving the content is preferable to maintaining a rewrite workaround.
Choose the correct method
| Method | Where it is configured | Does the browser URL change? | Does the filesystem root change? | Best use | Main risk |
|---|---|---|---|---|---|
Change DocumentRoot |
Main Apache configuration or virtual host | No | Yes | You administer the server and the site genuinely lives in the new directory | Requires configuration access and an Apache reload or restart |
Internal rewrite in .htaccess |
Per-directory file under the active document root | No | No | Shared hosting or a controlled URL-to-subdirectory mapping | Rewrite loops, incorrect relative paths, and rules being ignored by server policy |
| External redirect | .htaccess or virtual-host configuration |
Yes | No | The public address should visibly move to another path or host | Changes bookmarks and can create redirect chains |
Alias mapping |
Main Apache configuration | Usually no | No | A URL path must map to a directory outside the document root | Not normally available when you only have .htaccess access |
If you have virtual-host access and every page, asset, and upload now belongs below one directory, use the first option. If you only have shared-hosting access, an internal rewrite is the practical substitute.
Prerequisites before editing .htaccess
Put the file in the directory Apache is actually serving
For a site whose configured root is /var/www/htdocs, the relevant file is normally /var/www/htdocs/.htaccess. A file in a parent directory, a sibling directory, or the target subdirectory cannot replace the root-level rules unless Apache is configured to search there. Confirm the active virtual host and its DocumentRoot with the administrator or hosting panel rather than assuming the path from your FTP account is the path Apache uses.
Allow rewrite directives
The virtual host must permit overrides for the directory. Apache documents this minimum setting:
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<Directory "/var/www/htdocs">
AllowOverride FileInfo
</Directory>AllowOverride All also permits the rewrite directives, but it grants substantially more override authority than many sites need. Without at least AllowOverride FileInfo (or AllowOverride All), rewrite directives in .htaccess are silently ignored.
Apache’s core directive documentation places RewriteEngine, RewriteOptions, RewriteBase, RewriteCond, and RewriteRule under the AllowOverride controls. The server must also have mod_rewrite loaded. In per-directory rewriting, Apache requires either Options FollowSymLinks or Options SymLinksIfOwnerMatch; your host may set this globally or restrict whether you can change it in .htaccess.
Back up and test one rule at a time
Keep a copy of the current file before adding a rule. Test a normal page, a real static file, a missing path, and the application’s entry URL. A syntax error or redirect loop can make the whole site return a server error, so make changes during a window in which you can restore the previous file or contact the host.
Point a URL path at a subdirectory with an internal rewrite
Suppose the active document root is /var/www/htdocs and an application is physically stored in /var/www/htdocs/app. If visitors should request /app/level-1 while Apache serves app/level-1, the documented per-directory pattern is:
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RewriteEngine On
RewriteRule ^app(?:/(.*))?$ app/$1 [L]In an .htaccess context Apache removes the directory prefix before matching the pattern. That is why the pattern starts with ^app, not ^/app. Apache explicitly notes that a pattern beginning with ^/ will never match in this context. The substitution is also relative: app/$1 means the app directory below the directory containing this file.
This particular rule handles requests that already use the /app URL prefix. If the desired public URL is the domain root—for example, visitors request /level-1 but the files live in the app subdirectory—use a root-level rule that excludes the target prefix on subsequent passes:
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RewriteEngine On
RewriteCond %{REQUEST_URI} !^/app(?:/|$)
RewriteRule ^(.*)$ app/$1 [L]Place this version in the current document-root directory. The condition prevents Apache from rewriting an internally generated /app/... request back into app/app/..., which is a common loop or duplicated-path failure. The browser continues to display the original URL because this is an internal rewrite, not a redirect.
How to adapt the root-to-subdirectory rule
- Replace
appwith the directory name relative to the active document root, without a leading filesystem slash. - Keep the
RewriteCondexclusion aligned with that same URL prefix, including its trailing-slash alternative. - Leave the
RewriteRulepattern without a leading slash. Apache has already stripped the per-directory prefix. - Request the site root and a nested path, then inspect the server log if either request produces a loop, 404, or 403 response.
Do not use this technique to hide a directory that should have its own authentication, uploads policy, or separate virtual host. Those boundaries are clearer and safer when expressed in the main server configuration.
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Use a front controller in a subdirectory
Many applications store a single entry script such as index.php in a subdirectory and expect every non-file URL to reach it. For an application at /myapp, a documented .htaccess pattern is:
RewriteEngine On
RewriteBase /myapp/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php [L]The two conditions preserve existing files and directories. CSS, JavaScript, images, downloads, and real directories can therefore be served normally, while an application route such as /myapp/profile is sent to index.php. The rule is normally placed in the application’s own directory, so its substitution is simply index.php.
Apache notes that FallbackResource can be simpler and more efficient for this particular front-controller use case. It is configured by the server administrator, so it may not be available on shared hosting. Use it when you control the virtual-host configuration and do not need the conditional rewrite behavior supplied by RewriteCond.
When RewriteBase matters
RewriteBase supplies the URL prefix Apache uses when it turns a relative substitution back into a URL path. It matters when the URL path and filesystem path do not line up—for example, when the directory is exposed through an Alias, a symlink, or another mapping boundary.
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It is not a universal requirement. A relative substitution inside a normally mapped directory often works without it. An absolute URL-path substitution or a full-URI substitution does not use RewriteBase. Add or correct the directive only after confirming that the URL-to-filesystem mapping is the problem; adding it blindly can conceal a misplaced rule.
| Situation | Typical treatment |
|---|---|
Root URL maps directly to the directory containing .htaccess |
Start with a relative substitution and no RewriteBase. |
Application is served below a URL prefix such as /myapp/ |
RewriteBase /myapp/ may be appropriate for relative substitutions. |
URL is provided by an Alias or symlink mapping |
Check the mapping and use RewriteBase when Apache needs the explicit URL prefix. |
| Substitution is an absolute URL path or complete URI | RewriteBase is not used. |
Why a RewriteRule appears to do nothing
- Verify the file’s location. Make sure the
.htaccessfile is inside the directory used by the active virtual host, not merely a directory visible in your hosting account. - Check
AllowOverride. Ask the administrator to confirmAllowOverride FileInfoorAllowOverride Allfor that directory. If overrides are disabled, Apache ignores the rewrite directives rather than applying a weaker version of them. - Confirm
mod_rewrite. On a server you administer, check the loaded modules and virtual-host configuration. On managed hosting, the provider must enable it. - Remove a leading slash from the pattern. In
.htaccess, use^appor^(.*)$, never^/app. Apache strips the directory prefix before matching. - Check the substitution and loop guard. A root-to-subdirectory rule needs a condition that excludes the target prefix on the next internal pass. Otherwise paths can become
app/app/...or trigger an internal redirect limit. - Review
RewriteBaseonly for a mapping mismatch. If the filesystem path and URL prefix differ because of an alias or symlink, supply the correct URL base. Do not use it to compensate for a rule placed in the wrong directory. - Read the Apache error log. Messages about too many internal redirects, forbidden rewrite processing, invalid directives, or a missing file identify different faults. Restore the previous file if the site becomes unavailable, then correct one issue at a time.
Common symptoms and likely causes
| Symptom | Likely cause | First check |
|---|---|---|
| The original page loads and the rule has no effect | Overrides are disabled, mod_rewrite is unavailable, or the rule is in an inactive directory |
AllowOverride, module status, and active DocumentRoot |
| Every request becomes a 404 | The substitution points to the wrong relative directory or the target file does not exist | Resolve the substitution from the directory containing .htaccess |
URLs become app/app/... |
The rule rewrites its own target on a later pass | Add or correct the REQUEST_URI exclusion |
| Apache reports an internal redirect limit | A rewrite loop or conflicting rules in parent and child directories | Inspect the error log and temporarily disable overlapping rules |
| Static assets fail while application routes work | The front-controller rule is catching real files | Use the !-f and !-d conditions |
| The rule matches nothing | The pattern begins with a slash | Remove / after the caret |
When changing DocumentRoot is the better fix
Use the virtual-host configuration when the directory change is permanent and under your control. A typical configuration is conceptually:
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ServerName example.test
DocumentRoot /var/www/htdocs/app
<Directory "/var/www/htdocs/app">
AllowOverride FileInfo
Require all granted
</Directory>
</VirtualHost>The exact access directives depend on the Apache version and server policy, so do not paste a generic block into production without checking the existing virtual-host configuration. After changing the root, validate the configuration and perform the host’s normal graceful reload. This approach avoids an extra rewrite pass, makes the filesystem and URL roots agree, and removes the need for loop-prevention rules. It also makes the intended root unambiguous to administrators, deployment tools, logs, and security rules.
Decision checklist
- Need only shared-hosting access? Use an internal rewrite in the active root’s
.htaccess. - Need the browser to display a different address? Use an explicit redirect instead of an internal rewrite.
- Have server configuration access and have all content moved permanently? Change
DocumentRoot. - Serving an application entry script? Preserve existing files and directories with
!-fand!-d. - Using an alias or symlink? Verify the URL/filesystem mapping and consider
RewriteBase. - Rule ignored? Check the file location,
AllowOverride, andmod_rewritebefore changing the pattern. - Rule loops? Exclude the target prefix and inspect parent-directory rules and the error log.
Bottom line
An .htaccess file cannot redefine Apache’s DocumentRoot. It can approximate a different root by internally rewriting requests into a subdirectory, provided the active directory allows FileInfo overrides, mod_rewrite is loaded, and the rules use per-directory syntax without a leading slash. For a permanent move when you control Apache, change DocumentRoot directly; reserve .htaccess rewrites for routing that genuinely belongs at the directory level.
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