How can I rewrite all:

/subscribe?foo=bar

into

/subscribe/?foo=bar

(note the trailing slash)

I've tried variations on this with no luck:

location / { root /var/www/docs/site.com/secure; index index.html index.htm index.php; rewrite ^/subscribe\?(.*) /subscribe/?$1 permanent; }

location /subscribe { index index.php; rewrite ^/subscribe\?(.*) /?$1 permanent; }