conditionally setting a cookie help (no replies)

Hi All,

I'm having trouble setting a cookie conditionally based upon
an upstream variable The hope is to cache an auth token in an
encrypted session and only go to the backend auth token generator once.

I have something like this but it seems set-cookie happens no matter what,
so I alternate between 'my_login=1848430=' and 'my_login='.

location = /auth {
set_decode_base32 $b32 $cookie_my_login;
set_decrypt_session $auth_tok $b32;

if ($auth_tok != '') {
return 200;
}

include fastcgi_params;
fastcgi_pass unix:/tmp/fcgi_auth_tok_gen.sock;
}

location / {
root /var/www;
index index.html index.htm;

auth_request /auth;
auth_request_set $new_auth_tok $upstream_http_auth_tok;

if ($new_auth_tok != false) {
set_encrypt_session $enc_auth_tok $new_auth_tok;
set_encode_base32 $b32 $enc_auth_tok;
add_header Set-Cookie 'my_login=$b32';
}
}

Ideas?
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