how to get an openstack token and validate it?

I followed this guide: http://keystone.openstack.org/api_curl_examples.html

and it seemed that I got a valid token by ran:

curl -d '{"auth":{"passwordCredentials":{"username": "can", "password": "mypassword"}}}' -H "Content-type: application/json" http://url:35357/v2.0/tokens

and it returned:

{
"access":
{
    "token":
    {
        "expires": "2012-05-21T14:35:17Z",
        "id": "468da447bd1c4821bbc5def0498fd441"
    },
    "serviceCatalog": {},
    "user":
    {
        "username": "can",
        "roles_links": [],
        "id": "bb6d3a09ad0c4924bf20c1a32ccb5781",
        "roles": [],
        "name": "can"
    }
}
}

but when I came to the next few sections to validate this token, I encountered this magic number: X-Auth-Token:999888777666. At first I thought it's the token I got but I was wrong.

I think I may have missed something, so I read related sections in openstack documents( http://keystone.openstack.org/configuration.html and http://docs.openstack.org/api/openstack-compute/programmer/content/ ), but still no idea how the number comes from.

could anyone explain to me

1)what's the meaning of that magic number
2)how to get the right value of it so I can get a working token to manage other parts of openstack