apache: basic authentication before rewrite

Question

I have an apache in frontend that redirect a request via a rewrite rule. I have to put a basic authentication before redirect a request, so I put this in the config file:

<VirtualHost *:443>
    ServerAdmin xxxxxx
    DocumentRoot /var/www/html/
    ServerName xxxxxxx
    RewriteEngine on
    ErrorLog logs/error.log
    CustomLog logs/access_log common

    <Directory /var/www/html/>
        AuthType Basic
        AuthName "Restricted Files"
        AuthUserFile /etc/httpd/conf/tag.pwd
        Require valid-user
        RewriteRule ^/(.*) http://xxxxxx:xxx/$1   [P,L]
    </Directory>
</VirtualHost>

But doesn't work.

Any suggestions?

Answer 1

<Location />
    AuthType Basic
    AuthName "Restricted Files"
    AuthUserFile /etc/httpd/conf/tag.pwd
    Require valid-user
    RewriteCond %{LA-U:REMOTE_USER} !^$
    RewriteRule ^/(.*) http://xxxxxx:xxx/$1   [P,L]
</Location>

Answer 2

I solved putting the rewrite condition and rewrite rule outside the Locatio directive:

<Location />
  AuthType Basic
  AuthName "Restricted Files"
  AuthUserFile /etc/httpd/conf/tag.pwd
  Require valid-user
</Location>
RewriteCond %{LA-U:REMOTE_USER} !^$
RewriteRule ^/(.*) http://xxxxxx:xxx/$1   [P,L]

many thanks to h0tw1r3 for the suggestion