.htaccess

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /1/

RewriteCond %{REQUEST_URI} /$ [NC]
RewriteCond %{REQUEST_URI} !(wp-admin). [NC]
RewriteRule ^(.*)(/)$ #$1 [L,R=301,NE]

RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /1/index.php [L]

</IfModule>

# END WordPress