HTTP/1.1 404 Not Found when setting auth_prefix to '/' in tempauth config

[Kota Tsuyuzaki]

using swift 1.7.5, using tempauth.
swift is running at localhost:8080.

proxy-server.conf

[filter:tempauth]
use = egg:swift#tempauth
auth_prefix = / # default is '/auth/'
user_swift_swift = swift .admin

When trying to authorize and get token with this config like keystone authorization, i.e.:
curl -X GET -v -H "X-storage-User: swift:swift" -H "X-Storage-Pass: swift" http://localhost:8080/v1.0
I get: HTTP/1.1 404 Not Found

Though using this config, I can get correct authorized 200 response with any prefix
like 'http://localhost:8080/auth/v1.0' and 'http://localhost:8080//v1.0' and all other prefix.
Besides this behaivor, when trying to GET request(or others), i.e:
curl -X GET -v -H "X-Auth-Token: xxxxxxxxxx" http://localhost:8080/v1/AUTH_swift/
(xxxxxxxxxx is authorized token)
I get: HTTP/1.1 400 Bad Request.

Therefore I can not operate on swift correctly with this config.
However I checked error logs, swift dumps no error logs about them.

[Kota Tsuyuzaki (tsuyuzaki-kota)]

Fix proposed to branch: master
Review: https://review.openstack.org/19050

Hudson did not link my code review.
Is it because I forgot to include bug number in a commit message?

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/19050
Committed: http://github.com/openstack/swift/commit/161aa89bd57bfa99c855133ff6330d27529d7f2b
Submitter: Jenkins
Branch: master

commit 161aa89bd57bfa99c855133ff6330d27529d7f2b
Author: Kota Tsuyuzaki <email address hidden>
Date: Sat Jan 5 23:56:59 2013 -0800

    prevent irregular auth_prefix config in tempauth

    Tempauth handles a authorization request by request path.
    If a request's path start with auth_prefix, tempauth middleware
    handles that request to authorization method.
    Therefore, when configuring auth_prefix to '/', all requests
    handle to authorization method.

    This change enables tempauth to prevent invalid auth_prefix
    config '/' and similar empty auth_prefix in initialization method.

    Fixes bug #1096538.

    Change-Id: I20b157e2a0809c17409fc65a8eff0858fe4aff29