Add "If-None-Match: *" support to PUT

[OpenStack Infra]

https://review.openstack.org/81646
commit 0b893825ebdd63d22d51cce42a3994f120f43921
Author: Chuck Thier <email address hidden>
Date: Wed Mar 19 21:51:17 2014 +0000

    Add "If-None-Match: *" support to PUT

    A common pattern that we see clients do is send a HEAD request before a
    PUT to see if it exists. This can slow things down quite a bit
    especially since 404s on HEAD are currently a bit expensive.

    This change will allow a client to include a "If-None-Match: *" header
    with a PUT request. In combination with "Expect: 100-Continue" this
    allows the server to return that it already has a copy of the object
    before any data is sent.

    I attempted to also include etag support with the If-None-Match header,
    but that turned up having too many hairy edge cases, so was left as a
    future excercise.

    DocImpact

    Change-Id: I94e3754923dbe5faba065719c7a9afa9969652dd

[Openstack Gerrit (openstack-gerrit)]

Fix proposed to branch: master
Review: https://review.openstack.org/91427

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/91427
Committed: https://git.openstack.org/cgit/openstack/api-site/commit/?id=b8f48044e62f2c8974c61c6dff929896aa2e2d62
Submitter: Jenkins
Branch: master

commit b8f48044e62f2c8974c61c6dff929896aa2e2d62
Author: Diane Fleming <email address hidden>
Date: Wed Apr 30 13:04:12 2014 -0500

    Add "If-None-Match" header to PUT requests in swift

    Closes-Bug: #1301677

    Change-Id: Ide993b736c116258e8d41b12d8c531feb05af552
    author: diane fleming