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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Use mod_rewrite to map a requested URL to another resource without changing what the visitor sees, or return a deliberate 3xx redirect that changes the browser’s address. Turn it on with RewriteEngine On, place rules in the right Apache context, order specific rules before catch-alls, and choose termination and redirect flags deliberately.
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The same-looking rule can behave differently in a virtual-host configuration and in .htaccess. The difference is the rewrite phase, the directory prefix, and whether Apache re-enters per-directory processing. The examples below show how to write, test, and secure rules in both environments.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsWhat mod_rewrite actually does
Apache’s mod_rewrite is a rule-based URL manipulation engine. Apache evaluates each RewriteRule in order. A RewriteCond placed immediately before a rule restricts whether that rule is allowed to run. The rule’s substitution can either map the request internally to another resource or send an external redirect response to the client. See the Apache mod_rewrite introduction for the processing model.
An internal rewrite is a server-side decision: Apache serves a different file or application route while the browser continues to display the original URL. An external redirect is an HTTP response: the browser receives a 3xx status and then requests the destination, so the address bar changes.
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| Decision | What the browser sees | Typical use | Example |
|---|---|---|---|
| Internal rewrite | Original URL remains visible | Map a clean route to a script or front controller | ^about$ about.php [END] |
| External redirect | Address changes after a 3xx response | Move an old URL to its canonical replacement | ^about-old$ /articles/about [R=301,END] |
A redirect is not merely an alternative spelling of a rewrite. It creates another client request and has cache and permanence consequences, while an internal rewrite stays within the current server request.
Choose the Apache configuration context first
The location of a rule determines when Apache evaluates it and what text the pattern matches. Apache documents these differences in its technical details for mod_rewrite.
Virtual-host or main-server configuration
When you administer Apache, put site-wide or virtual-host rules in the server or virtual-host configuration. They run in the main rewrite processing phase, before per-directory rewriting. This gives you clearer control over the request flow and avoids relying on distributed override files.
.htaccess per-directory configuration
Use .htaccess when the hosting arrangement does not give you access to the main configuration. Apache must permit the required directives through its AllowOverride settings; if overrides are disabled, a syntactically correct file will not take effect.
In per-directory context, Apache removes the directory prefix before matching a RewriteRule. A rule in the document root therefore normally matches about, not /about. A file in a subdirectory sees a path relative to that directory. This is the most common reason a rule copied from a virtual-host configuration fails in .htaccess.
| Where the rule lives | Processing behavior | Pattern guidance | Best fit |
|---|---|---|---|
| Server or virtual-host configuration | Main rewrite phase | Use the URL path form expected by that context | Administrators who control Apache |
Document-root .htaccess |
Later per-directory phase; directory prefix stripped | Usually omit the leading slash and directory prefix | Restricted hosting access |
Nested .htaccess |
Per-directory processing for that directory | Match the path relative to the nested directory | Rules local to a subtree |
Adapt examples to the context
The same logical mapping can need a different pattern or substitution in a virtual host than in .htaccess. Do not add a leading slash simply because the browser displays one. Confirm the path Apache presents to the rule in the context where it runs.
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Prerequisites and a safe starting file
- Apache must have
mod_rewriteloaded and the relevant rewrite directives permitted in the chosen context. - Start with a backup of the active virtual-host configuration or
.htaccessfile. - Make one logical change at a time so a failing request can be tied to a specific rule.
- Test a non-destructive URL before replacing a broad routing rule.
A minimal rule set begins by enabling the engine:
RewriteEngine OnIn a document-root .htaccess, that line is followed by rules whose patterns usually omit the leading slash. In server configuration, use the path syntax required by that configuration context.
Understand the anatomy of a rewrite rule
RewriteRule Pattern Substitution [Flags]Pattern
The pattern is matched against the URL path presented in the current context. In per-directory processing, the directory prefix has already been removed. Anchors such as ^ and $ make a rule apply to the complete intended path rather than an accidental substring.
Substitution
The substitution is the resource or URL Apache should use when the pattern matches. A relative substitution commonly names a local resource for an internal mapping. A path beginning with / is an absolute URL-path on the same host for a redirect example. Keep substitutions constrained to the resources and hosts your application actually intends to expose.
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Flags
Flags change what happens after a match. Separate multiple flags with commas inside brackets. The flags most relevant to URL rewriting are:
| Flag | Effect | Use carefully when |
|---|---|---|
L |
Stops the current round of rewrite processing. | Later rules in the same round must not run. |
END |
Stops all per-directory rewrite processing. | You need to prevent a new per-directory pass, especially in .htaccess; confirm support in the Apache version deployed. |
R=301 |
Sends a permanent redirect response. | The old URL has permanently moved and clients should use the new one. |
PT |
Passes the result back through URL mapping so directives such as Alias can act on it. |
The rewritten result must participate in another URL-to-resource mapping stage. |
Apache’s complete flag behavior is documented in the RewriteRule flags reference.
Write the two fundamental URL mappings
Internal rewrite: keep /about in the address bar
RewriteEngine On
RewriteRule ^about$ about.php [END]When the request matches the complete path about in the applicable context, Apache serves about.php internally. The visitor continues to see /about. In a context where END is unsuitable or unavailable, use the termination behavior appropriate to that Apache version and processing phase.
Permanent redirect: move an old path
RewriteEngine On
RewriteRule ^about-old$ /articles/about [R=301,END]This sends a permanent redirect, so the client requests /articles/about and displays that new path. Use a permanent status only after the mapping is verified; changing a cached permanent redirect can be difficult for visitors and intermediaries.
Do not confuse the two outcomes
- Choose an internal rewrite when the public URL is already the URL you want people to bookmark, while the application resource has a different internal name.
- Choose a redirect when clients must learn a new canonical URL, such as after a deliberate content move.
- Do not add
R=301merely to make an internal route work; it changes the browser-visible behavior.
Use conditions for metadata and resource checks
A RewriteCond applies to the next RewriteRule, and conditions are evaluated as part of deciding whether that rule runs. Use them when the decision depends on request metadata or whether a resource already exists.
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Protect existing files and directories
A common application-router design lets Apache serve real files and directories normally, then sends only the remaining paths to an application. The exact condition and substitution must match the site’s layout, but the structure is:
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^ app.php [END]The two exclusions mean “not an existing file” and “not an existing directory.” Verify that the application entry point and the path seen by Apache match your deployment before using this pattern. A broad catch-all placed before these exclusions can intercept assets or directories unintentionally.
Keep conditions attached to the intended rule
Because a condition governs the following rule, place each condition immediately above the rule it qualifies. Conditions do not form a global filter for every rule below them. If several rules need the same test, repeat it deliberately or reorganize the rules so the scope is obvious.
Order narrow rules before broad ones
Apache evaluates rules sequentially. Put canonicalization rules and explicit exclusions before a broad application route. Otherwise, the catch-all can consume a request before the specific redirect or file check has a chance to run.
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Prevent rewrite loops and accidental re-entry
Rewrite loops occur when a substitution causes Apache to evaluate a path that matches the same rule again. They are especially easy to create in .htaccess, where per-directory processing can happen again after an internal mapping.
Use complete matches
Anchor rules to the exact route they are intended to handle. For example, ^about$ cannot also match about/team. Avoid an unbounded catch-all until the explicit routes, file exclusions, and termination behavior are working.
Choose L or END for the intended scope
L stops the current round, but it does not necessarily prevent another per-directory round. END stops all per-directory rewrite processing and is useful in .htaccess when an internal route would otherwise re-enter the rules. The correct choice depends on the processing context and Apache version.
Keep redirect targets outside the redirect pattern
A redirect rule should not send the request to another URL that satisfies the same redirect condition. If an old path redirects to a canonical path, make the old-path pattern specific enough that the canonical path does not match it.
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Diagnose the first redirect, not the last browser error
Use a client that shows response headers and inspect each request in sequence. A loop is usually visible as the same small set of paths alternating, or as a path that repeatedly gains and loses a prefix. Correct the first rule that changes the request unexpectedly, then retest with a fresh client session.
Security rules for substitutions and redirects
Prevent open redirects
Never build a redirect destination from unvalidated user input. Apache warns: “If a RewriteRule constructs a redirect URL using unvalidated user input, an attacker can craft a link that redirects visitors to a malicious site while appearing to originate from your domain.” The warning appears in the mod_rewrite introduction.
Prefer a fixed relative path or a destination selected from a server-side allowlist. If a query parameter or path segment influences the destination, validate it before it reaches the substitution and reject values that introduce another host or scheme.
Do not expose an arbitrary proxy target
User-controlled backreferences must not select arbitrary targets for the [P] proxy behavior. Doing so can turn the rewrite rule into a server-side request forgery path, allowing the server to make requests to destinations the visitor should not control.
Constrain filesystem mappings
A broad capture such as (.+) can accept more path material than intended when request data is mapped to the filesystem. Use restrictive character classes and explicit route shapes. Normal Apache <Directory> protections still matter; a rewrite rule is not a replacement for filesystem authorization.
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Treat backreferences as untrusted data
Captures from the requested URL can contain unexpected characters or encodings. Use them only where the target format is constrained, and do not let a captured value determine an external host, proxy destination, or unrestricted filesystem path.
Build a maintainable rule set
Separate canonicalization from application routing
Put host or path canonicalization rules first, then explicit legacy redirects, then existing-file and existing-directory exclusions, and finally the application’s broad route. This ordering follows Apache’s sequential evaluation model and makes each responsibility visible.
Comment the intent, not the obvious syntax
Explain why a rule exists, which context it belongs to, whether the destination is internal or external, and whether the redirect is intentionally permanent. Comments that only restate “rewrite about to about.php” do not help when the site changes.
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A rule copied from a virtual-host file may require a different pattern in .htaccess. Record the file location next to deployment documentation so a future change does not reintroduce a leading-slash or directory-prefix error.
Use termination flags consistently
Choose a convention for internal routes and document why it exists. Mixing L and END without understanding their scope can make one route stop while another re-enters, producing behavior that appears random.
Deployment workflow
- Select the context. Use the virtual-host or main-server configuration when you administer Apache. Use
.htaccessonly when main configuration access is unavailable and overrides permit the needed directives. - Enable the engine. Add
RewriteEngine Onin the selected context. - Start with one exact route. Test a narrow internal rewrite such as
^about$ about.php [END]before adding conditions or a catch-all. - Verify the response type. An internal rewrite should serve the target while retaining the requested URL; a redirect should return a 3xx response and cause a second client request.
- Add explicit redirects. Place legacy-to-canonical mappings before broad routing and use
R=301only for a confirmed permanent move. - Add exclusions. Protect existing files and directories before the application route if the site uses a front controller.
- Review loop boundaries. In
.htaccess, decide whetherENDis needed to prevent another per-directory pass. - Test hostile inputs. Try unexpected path segments, encoded characters, absolute-looking destinations, and values that could become proxy or filesystem targets. Confirm they are rejected or safely constrained.
- Document the final order. Record which rules are canonicalization, redirects, exclusions, and application routing so later edits preserve their dependencies.
Troubleshooting by symptom
The rule works in the virtual host but not in .htaccess
Check the pattern first. In per-directory context the directory prefix is stripped, so remove the leading directory path and usually the leading slash. Then confirm that AllowOverride permits the directives and that RewriteEngine On is present in the active file.
The browser changes URL when it should not
Look for an R flag or another rule issuing a redirect. Remove the redirect flag for an internal mapping and ensure that the substitution is not an absolute external URL.
The browser keeps the old URL when it should change
A substitution without R is an internal rewrite. Add an intentional redirect status, such as R=301 for a permanent move, and verify that the target does not match the source rule.
Every request returns a redirect loop
Inspect the sequence of locations returned by the server. Check for a rule whose destination still matches its own pattern, a canonicalization rule that alternates between two forms, or a per-directory re-entry that L did not stop. Tighten the pattern and use END where complete per-directory termination is required and supported.
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Images or directories are routed to the application
Move the existing-file and existing-directory conditions above the catch-all rule. Confirm that the conditions use the correct request filename for the directory layout; a condition copied from another site can exclude the wrong resources.
An alias no longer resolves after rewriting
If the rewritten result must pass through Apache’s URL mapping so an Alias can act on it, use the PT flag where appropriate. Check the mapping order and ensure the substitution is the URL-path expected by the alias.
A redirect can be weaponized
Find any user-controlled value reaching the redirect substitution. Replace unrestricted concatenation with a fixed relative destination or an allowlisted value. Apache’s security guidance treats unvalidated redirect construction as an open-redirect risk.
A proxy rule reaches internal services
Do not let user-controlled backreferences select a [P] target. Restrict proxy destinations to trusted, fixed endpoints and remove proxy behavior from general-purpose path captures.
Practical rule patterns
One clean route to one script
RewriteEngine On
RewriteRule ^profile$ profile.php [END]This is appropriate when the public route is fixed and the implementation file should remain hidden from the browser.
One old route to one new route
RewriteEngine On
RewriteRule ^legacy-news$ /news [R=301,END]Use this only when /legacy-news has permanently moved to /news. Keep the source pattern exact so the destination cannot trigger the same redirect.
Application fallback after real resources
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^ index.php [END]This sends non-file, non-directory paths to an application entry point. Replace index.php with the actual entry point and test static assets, directory indexes, and error handling before deploying.
How to decide between the main configuration and .htaccess
If you control the virtual host, prefer that configuration for predictable processing and centralized review. It keeps rewrite policy with the site definition and avoids the per-directory prefix and re-entry behavior that complicate debugging.
If the host denies main-configuration access, .htaccess is the practical option identified in Apache’s URL remapping guide. Confirm override permissions, write patterns relative to the directory, and use termination behavior that accounts for per-directory processing.
| Question | Choose server or virtual-host configuration when… | Choose .htaccess when… |
|---|---|---|
| Who controls Apache? | You administer the site’s Apache configuration. | The hosting arrangement withholds main configuration access. |
| Where should policy live? | In a centrally managed virtual-host or server definition. | In a directory-local file permitted by AllowOverride. |
| What must you watch? | Main-phase ordering and URL-path syntax. | Stripped directory prefixes, later processing, and re-entry. |
Reference checklist before publishing a rule
- Is
RewriteEngine Onactive in the context that handles the request? - Does the pattern match the path form for that context, especially in
.htaccess? - Is the result intentionally internal or intentionally a redirect?
- If it redirects, is the status code and permanence appropriate?
- Are narrow rules, canonicalization, and exclusions above broad catch-alls?
- Could the substitution cause another per-directory pass or match the same rule again?
- Are existing files and directories protected where the application router requires it?
- Can any user-controlled value create an external host, a proxy target, or an unrestricted filesystem path?
- Does the rule need
PTso anAliascan process the result? - Have you tested both the expected request and malformed or hostile variants?
For directive semantics and context-specific behavior, consult Apache’s mod_rewrite introduction, technical details, remapping guide, and flags reference.
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