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wrong password set in api-paste.ini, but still pass the auth

I'm working on Grizzly, and I saw a really strange phenomenon in keystone log.

When I run command "nova list", I get two INFO output: 2013-06-19 15:01:26 INFO [access] - - [19/Jun/2013:07:01:26 +0000] "POST http://keystone:5000/v2.0/tokens HTTP/1.0" 200 5143 2013-06-19 15:01:26 INFO [access] - - [19/Jun/2013:07:01:26 +0000] "GET http://keystone:35357/v2.0/tokens/revoked HTTP/1.0" 200 504

I think this matches my understanding about how auth work, although I have questions about the "revoked". First, user get a new token, then nova verify the token.

Then, suddenly, the second log disappeared, I can only get: 2013-06-20 16:35:45 INFO [access] - - [20/Jun/2013:08:35:45 +0000] "POST http://keystone:5000/v2.0/tokens HTTP/1.0" 200 5143

This come to me a question, how nova-api verify user's token ? So, I edited /etc/nova/api-paste.ini, changed admin_password to a wrong number, and cleaned all tokens in keystone, and restart nova-api. I suppose this will cause "nova list" failed in auth. But, I still get my instance list.

How could this happen ?