Use mod_rewrite to redirect from example.com/dir to www.example.com/dir

Assume / is the document root of my domain example.com.

/.htaccess

RewriteEngine on
RewriteCond %{HTTP_HOST} ^example\.com$ [NC]
RewriteRule ^(.*)$ http://www.example.com/$1 [R=301,L]

/dir/.htaccess

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /dir/index.php [L]
</IfModule>

I know how to redirect example.com/dir to www.example.com/dir, because /.htaccess does the very job.

However, the trick here is that I have to keep /dir/.htaccess to serve up virtual directories (such as /dir/state/AK/35827/ which aren't actual directories) if you know what I mean.

Problem is, if I keep /dir/.htaccess, a request of:

http://example.com/dir/state/AK/35827/

DOES NOT redirect to:

http://www.example.com/dir/state开发者_开发知识库/AK/35827/

as would:

http://example.com/

redirect to:

http://www.example.com/

Not sure if I made it clear.

Basically, how to make http://example.com/dir/state/AK/35827/ correctly redirect to http://www.example.com/dir/state/AK/35827/ AND I can serve virtual URLs?

If you do have access to your apache VirtualHosts configuration then you need:

<VirtualHost *:80>
    ServerName example.com
    Redirect permanent / http://www.example.com/
</VirtualHost>

This will succesfully redirect http://example.com/ to http://www.example.com/ and http://example.com/dir/state/AK/35827/ to http://www.example.com/dir/state/AK/35827/

The "problem" here is that mod_rewrite does not "inherit" the parent config (.htaccess) by default. The mod_rewrite directives in the subdirectory completely override the mod_rewrite directives in the parent directory (different to other modules).

You either need to:

• Copy the canonical www redirect from the parent .htaccess file into /dir/.htaccess. But code duplication is not desirable.

• OR: Enable mod_rewrite inheritance in the child .htaccess file:

  RewriteOptions inherit
  

  This effectively "copies" the mod_rewrite directives from the parent .htaccess file. However, if you have other directives, this might not work as expected. Note that this "copies" the directives, without changing the directory-prefix.

• OR: do everything in the parent .htaccess file. Having a single .htaccess file is probably the preferred solution. For example:

  RewriteEngine on
  
  # Canonical redirect
  RewriteCond %{HTTP_HOST} ^example\.com$ [NC]
  RewriteRule ^(.*)$ http://www.example.com/$1 [R=301,L]
  
  # Virtual directories...
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^dir/ dir/index.php [L]