RewriteCond %{REQUEST_FILENAME} !-f含义及Nginx等价配置转换求助

What does RewriteCond %{REQUEST_FILENAME} !-f mean? #

This is an Apache rewrite condition that checks if the requested path does not correspond to an existing regular file on the server filesystem:

• ! negates the check (so "not")
• -f tests whether the request maps to a valid, regular file (as opposed to a directory, symlink, etc.)

Combined with the second condition !-d, these rules tell Apache to skip the rewrite if the request targets a real file or directory—only rewriting when the path doesn't exist on disk.

Why the online tool's Nginx config fails with ?id=10 #

The generated try_files rule replaces the original query string when specifying /index.php?rt=$1. Unlike Apache's QSA (Query String Append) flag, try_files doesn't automatically preserve existing query parameters. This is why $_GET['id'] is null—those parameters are discarded instead of being appended to the new query string.

Equivalent Nginx Config (matches Apache's behavior exactly) #

To replicate the full functionality of your Apache rules (including preserving query parameters and escaping special characters), use this configuration:

# Serve existing files and directories directly
location / {
    try_files $uri $uri/ @fallback;
}

# Rewrite non-existent paths to index.php with preserved query params
location @fallback {
    # Capture the path after the root, escape special characters (matches Apache's B flag)
    # Use QSA to append original query parameters (matches Apache's QSA flag)
    rewrite ^/(.*)$ /index.php?rt=$escape_uri($1) QSA last;
}

Key details matching Apache's behavior: #

1. try_files $uri $uri/ @fallback: Skips rewrite for existing files ($uri) and directories ($uri/), mirroring Apache's !-f and !-d conditions.
2. $escape_uri($1): URL-escapes the captured path, replicating Apache's B flag to handle special characters (spaces, ampersands, etc.) correctly.
3. QSA flag: Appends the original query string (e.g., ?id=10) to the new rt=$1 parameter, ensuring all $_GET variables are preserved.
4. last flag: Stops processing further rewrite rules for this request, matching Apache's L flag.

If you're using an older Nginx version without escape_uri() support, use $uri (already escaped) and strip the leading slash:

location @fallback {
    rewrite ^.*$ /index.php?rt=$substr($uri, 1) QSA last;
}

内容的提问来源于stack exchange，提问作者Martin AJ