There is no line-for-line .htaccess-to-Nginx converter. Apache .htaccess rules run in a per-directory context, while Nginx reads one explicit configuration made of http, server, and location blocks. A reliable migration therefore starts by documenting what each rule does—redirect, internal rewrite, file test, access decision, or backend hand-off—and then expressing that behavior with the Nginx directive that matches the intent.
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Use return for unconditional redirects, dedicated server blocks for canonical hosts, try_files for existing-file-or-front-controller routing, rewrite for genuine regular-expression transformations, and a named location or proxy_pass for application backends. Validate with nginx -t, then compare status codes, Location headers, query strings, final URIs, and application logs against the old site.
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Why .htaccess rules cannot be copied directly
Apache’s RewriteRule has a pattern, a substitution, and optional flags. RewriteCond lines test expanded values such as the host, port, query string, or filesystem state before the rule runs. The meaning of the pattern also depends on where the rule is defined.
In virtual-host or server context, Apache matches the URL path. In a per-directory .htaccess file, Apache removes the directory prefix before matching. A rule in /blog/.htaccess can therefore see post/, whereas an equivalent Nginx location may see /blog/post/. Relative substitutions, leading slashes, and filesystem paths can all change as a result.
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Apache also processes per-server rewrites during URL-to-filename translation and per-directory rewrites later, during the fixup phase. Nginx has no per-directory configuration mechanism: every rule must be placed explicitly in an http, server, or location context, with the site’s root, index handling, PHP-FPM settings, and proxy behavior visible in the same configuration.
Think of the migration as a semantic rewrite. Preserve the request outcome, not the original directive spelling.
Build an inventory before writing Nginx syntax
Export the complete chain of rules, including inherited files and every condition. For each rule, record the following:
- Original context: document root, a subdirectory, virtual host, or an included file.
- Match: the exact path, host, query string, or header tested, including whether Apache had already removed a directory prefix.
- Action: external redirect, internal URI change, filesystem mapping, access denial, or application hand-off.
- Conditions: positive and negated tests, their order, and any captures used in the substitution.
- Status: the intended redirect code, such as 301 or 302, or an internal rewrite with no client-visible redirect.
- Arguments: whether the original query string is retained, replaced, or discarded.
- Filesystem assumptions: document root, directory indexes, maintenance files, extension fallbacks, and symbolic links.
- Terminal behavior: what Apache’s
[L],[END], or other flags prevented or allowed in later passes.
Make a test list at the same time. Include canonical and non-canonical hosts, an existing asset, an existing directory, a missing path, a path with encoded characters, a URL with a query string, and at least one route that reaches the application backend.
Map Apache concepts to Nginx contexts
| Apache construct | Nginx approach | Important difference |
|---|---|---|
.htaccess in a directory |
Explicit server and location configuration |
Nginx never discovers per-directory files. You must choose the context and add any directory prefix consciously. |
RewriteRule used for an unconditional redirect |
return 301 or return 302 |
return is clearer and avoids an unnecessary regular-expression pass. |
| Pattern-based URI transformation | rewrite |
Nginx captures are typically referenced as $1, $2, and so on; choose the processing flag deliberately. |
-f and -d file or directory tests |
try_files |
Nginx tests paths against the configured root and can fall through to a URI or named location. |
| Front-controller fallback | try_files $uri $uri/ /index.php?$args; |
The explicit $args preserves the incoming query string. |
| Application hand-off | Named location with proxy_pass, or a PHP-FPM location |
Keeping filesystem tests separate from proxy settings makes the flow easier to audit. |
HTTP_HOST conditions |
server_name selection or a narrowly scoped condition |
Positive host definitions and a catch-all default server are usually safer than a complex negated condition. |
Apache [L] |
last, break, a named location, or no rewrite flag |
last starts a new location search; break stays in the current location. Neither is a mechanical replacement for [L]. |
Convert canonical-host redirects first
Host canonicalization is best expressed by server selection, not by combining an if statement with a rewrite. Suppose requests for example.org must move to www.example.org while retaining the original path and query string:
server {
listen 80;
server_name example.org;
return 301 http://www.example.org$request_uri;
}
server {
listen 80;
server_name www.example.org;
# normal site configuration
}$request_uri contains the original path and arguments, so the redirect does not silently lose a query string. Use HTTPS in both the listener and destination when that is the site’s canonical scheme. Use 302 instead of 301 only when the redirect is intentionally temporary; browsers and intermediaries cache 301 responses aggressively.
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For requests arriving on unexpected host names, define a default_server catch-all that returns the chosen canonical host. This turns Apache logic such as “every host except these approved names” into explicit server selection and avoids relying on a fragile negative condition. Validate that the redirect cannot point back to the same host, which is a common source of loops.
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Translate WordPress and other front controllers with try_files
The common Apache pattern is: if the request maps to a real file or directory, serve it; otherwise send it to index.php. In Nginx, the direct form is:
server {
listen 80;
server_name www.example.org;
root /var/www/example.org/current/public;
location / {
try_files $uri $uri/ /index.php?$args;
}
}$uri checks the requested file, $uri/ checks a directory, and the final URI is used only when neither exists. The ?$args suffix carries the incoming query string to the front controller. Omitting it can break searches, filters, pagination, and tracking parameters that the application expects.
The PHP execution block is separate from the routing rule. A typical installation passes index.php to PHP-FPM and rejects or handles other scripts according to the application’s security policy. Do not send every arbitrary path to a script handler simply because the front controller exists; keep the script location narrow and test direct requests to unintended PHP files.
Replace multi-stage file checks with a named backend location
Some Apache configurations test a maintenance page, the requested file, an index file, and an extension variant before forwarding anything else to an application cluster. Nginx can express that sequence without a chain of regular expressions:
server {
listen 80;
server_name app.example.org;
root /var/www/myapp.com/current/public;
location / {
try_files /system/maintenance.html
$uri
$uri/index.html
$uri.html
@app-server_cluster;
}
location @app-server_cluster {
proxy_pass http://app-server;
}
}The first existing candidate wins. If the maintenance file exists, every request is served from it; otherwise Nginx checks the requested path and the two fallback forms before entering the named location. A named location is an internal hand-off, not a client redirect, so the browser keeps the original URL. Configure proxy headers, timeouts, buffering, and TLS settings for the upstream separately, and confirm that the upstream name resolves in the Nginx runtime environment.
Use rewrite for real regular-expression transformations
Nginx’s rewrite directive accepts a regular-expression pattern and replacement. Captures from the pattern are available as $1, $2, and later numbers. Rewrite directives execute in order, so put specific transformations before broad ones.
location /legacy/ {
rewrite ^/legacy/(.*)$ /archive/$1 permanent;
}This sends a permanent redirect because permanent produces a 301 response. If the client should not see a redirect and the request should be handled internally, use an internal replacement and choose processing behavior based on the desired location search. Use return when no pattern match is needed:
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location = /old-home {
return 301 /;
}Be precise about the context in which the pattern runs. A regular-expression location and a rewrite inside that location do not necessarily see the same path representation as an Apache rule copied from a subdirectory file. Test with and without a leading slash rather than assuming the original pattern can be pasted unchanged.
Choose last and break intentionally
Nginx’s processing flags have different control flow:
laststops the current rewrite set and starts a new location search using the changed URI.breakstops rewrite processing in the current context and continues there with the changed URI.redirectcreates a temporary external redirect.permanentcreates a permanent external redirect.
Using last inside a location that also matches the rewritten URI can repeatedly re-enter the same logic. That produces a rewrite loop or a “too many internal redirects” error. Use break when the URI should remain in the current location, or route directly to a named location when the next step is an application hand-off. A rule that was marked Apache [L] may require any of these choices—or no Nginx rewrite flag—depending on whether Apache’s original result was a redirect, a new internal URI, or a filename mapping.
Keep exact-match and narrow prefix locations ahead of broad fallbacks. A catch-all location / should not intercept a path that needs a dedicated static, API, or script policy.
Preserve or replace query strings deliberately
Query-string behavior is one of the easiest migration details to lose. For an external redirect, return 301 https://www.example.org$request_uri; preserves the original path and arguments. For a front-controller fallback, /index.php?$args appends the existing arguments to the internal URI.
A rewrite replacement that contains a new question mark defines a new argument string. If the replacement has no question mark, Nginx generally carries the original arguments for an internal rewrite; verify this behavior for each rule rather than relying on memory, especially when the Apache substitution explicitly used a trailing ? to discard arguments. Test an input such as /search?q=arcade&page=2 and inspect both the application’s received parameters and the browser’s visible URL.
Map conditions without recreating Apache’s syntax
Apache conditions can inspect the host, port, query string, request headers, and filesystem. In Nginx:
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- Use
server_nameand separate server blocks for host decisions. - Use
$request_uri,$uri, and$argsfor URI and query-string tests. - Use
try_filesinstead of repeated filesystemifchecks. - Use a narrowly scoped
ifonly when a condition cannot be represented by server or location selection; avoid using it as a general programming language. - Use maps or named locations when several conditions must feed one stable outcome.
Apache condition captures and rule captures are separate concepts. Recreate each capture deliberately and check which value a replacement references. A host capture should not accidentally be reused as a path capture simply because both were numbered in the original file.
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The rule never matches
Check the context first. A pattern copied from /shop/.htaccess may need the /shop/ prefix in Nginx. Also check whether the Nginx directive sees a leading slash, whether a more specific location won selection, and whether URL decoding changed the characters you are testing.
A redirect loops
Inspect the response’s Location header with a command such as curl -I. Confirm that the destination host differs from the source when canonicalizing hosts, that HTTP and HTTPS blocks do not redirect to each other, and that a rewritten URI does not re-enter the same last rule. A default server should not redirect a request to a name that resolves back to the default server with the same rule.
The browser receives a 200 instead of a 301
The configuration probably performed an internal rewrite or reached a backend that returned 200. Use return 301 or a rewrite with permanent when the client must update its URL. Then test the status code and Location header, not only the final page content.
Arguments disappear
Check every substitution containing ?. Add $args where the application needs the original query string, and verify that a redirect uses $request_uri or an equivalent explicit argument policy.
Static files fall through to the application
Confirm the effective root, file permissions, and the exact path tested by try_files. A wrong root makes every file appear missing. Check both an existing file and an existing directory before changing the fallback rule.
Nginx reports too many internal redirects
Look for a last rewrite that targets a URI matched by the same location, a front-controller URI that is routed back through itself, or overlapping regex locations. Replace the loop with break, an exact location, or a named backend location as appropriate.
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The backend receives an unexpected URI
Compare proxy_pass placement with the selected location and inspect upstream access logs. A proxy hand-off is not the same as an external redirect, and a named location may preserve a different internal URI than a new location search would.
Validate the converted configuration safely
- Run
nginx -t. Do not reload a configuration that fails syntax or dependency checks. - Reload Nginx using the service method appropriate to the operating system, then confirm the worker processes accepted the new configuration.
- Test each canonical host over every configured scheme and port. Record the status code, redirect chain, and exact
Locationvalue. - Request a known static file, a known directory, a missing path, and a path that should reach the front controller.
- Repeat those requests with query strings, percent-encoded characters, trailing slashes, and unusual but valid path segments.
- Exercise at least one PHP-FPM route and one proxied application route. Compare the URI, arguments, host header, and scheme seen by the application.
- Inspect Nginx error and access logs alongside application logs. A successful browser render can hide a wrong status code, an extra internal redirect, or a backend retry.
- Compare cache behavior and canonical URLs before removing the Apache configuration. Keep a rollback copy until representative traffic behaves identically.
A practical conversion worksheet
For a large site, maintain one row per original rule with these columns:
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| Arguments | Preserved, replaced, or intentionally removed. |
| Nginx context | Specific server, exact location, prefix location, regex location, or named location. |
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This worksheet prevents two frequent mistakes: losing a rule that lived in an inherited directory, and translating a control-flow flag before deciding what the request is supposed to do.
When to simplify instead of reproducing every rule
Apache configurations often accumulated compatibility rules for old URLs, multiple applications, and historical hosting layouts. Nginx does not need a one-for-one copy when several rules have the same outcome. Consolidate canonical-host handling into server blocks, replace repeated file tests with one try_files sequence, and send all application misses to one named backend location when that is the actual contract.
Do not simplify away observable behavior. Keep separate rules when status codes differ, when one path must retain arguments and another must discard them, when a redirect is external but another transformation is internal, or when security and caching policies differ. The goal is fewer moving parts with the same tested outcomes—not fewer lines at any cost.
Final decision guide
- Choose server selection plus
returnfor canonical host or scheme redirects. - Choose
try_filesfor “serve a real file or directory, otherwise use the application” behavior. - Choose
rewriteonly when a regular-expression transformation is genuinely required. - Choose
breakwhen an internal URI change must remain in the current location. - Choose
lastonly when a new location search is intentional and cannot loop. - Choose a named location to separate filesystem checks from proxying or another backend hand-off.
- Choose explicit query-string handling whenever the old rule changed or depended on request arguments.
A successful conversion is demonstrated by equivalent requests and responses, not by similar-looking configuration text. Once every rule has an explicit Nginx context, an intentional status and URI outcome, tested argument behavior, and a verified terminal path, the migration is maintainable instead of merely syntactically plausible.
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