Comment 5 for bug 1845530

Reviewed: https://review.opendev.org/685181
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=1e907602e37fb55bbe5a20164db6d074f87369af
Submitter: Zuul
Branch: master

commit 1e907602e37fb55bbe5a20164db6d074f87369af
Author: Eric Fried <email address hidden>
Date: Thu Sep 26 16:52:12 2019 -0500

    Allow versioned discovery unauthenticated

    Make routes to the versioned discovery documents (/v2, /v2.1) go through
    paste pipelines that don't require authentication, while leaving their
    sub-URLs (/v2.1/servers etc) requiring authentication.

    To make this work, our URLMap matcher gets support for a very
    rudimentary wildcard syntax, whereby api-paste.ini can differentiate
    between {/v2.1, /v2.1/} and /v2.1/$anything_else. The former points to
    the unauthenticated discovery app pipeline; the latter points to the
    existing "real API" pipeline. Similar for legacy v2.

    This entails a slight behavior change: requests to /v2 and /v2.1 used to
    302 redirect to /v2/ and /v2.1/, respectively. Now they just work.

    Change-Id: Id47515017982850b167d5c637d93b96ae00ba793
    Closes-Bug: #1845530
    Closes-Bug: #1728732