Site Files Redirect D7

.htaccess

### Apache Rewrite
  <IfModule mod_rewrite.c>
    RewriteEngine on
    # Force image styles that have local files that exist to be generated.
    RewriteCond %{REQUEST_URI} ^/sites/([^\/]*)/files/styles/[^\/]*/public/((.*))$
    RewriteCond %{DOCUMENT_ROOT}/sites/%1/files/%2 -f
    RewriteRule ^(.*)$ $1 [QSA,L]
    # Otherwise, send anything else that's in the files directory to the
    # production server.
    RewriteCond %{REQUEST_URI} ^/sites/[^\/]*/files/.*$
    RewriteCond %{REQUEST_URI} !^/sites/[^\/]*/files/css/.*$
    RewriteCond %{REQUEST_URI} !^/sites/[^\/]*/files/js/.*$
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ http://dev.example.com/$1 [QSA,L]
  </IfModule>

vhost.conf

### nginx Rewrite
    ## Try local files first, otherwise redirect to a development server.
    location ^~ /sites/default/files {
      try_files $uri @dev_redirect;
    }
    ## Development Server Redirect
    location @dev_redirect {
      rewrite ^ http://dev.example.com$request_uri? permanent;
    }