Use POST in bulk-delete

[OpenStack Infra]

https://review.openstack.org/53090
commit 94090e8760da324d6586b5d45b7c339457e33647
Author: Kun Huang <email address hidden>
Date: Tue Oct 22 18:05:43 2013 +0800

    Use POST in bulk-delete

    The DELETE verb applies to a single resource, and doesn't define any
    semantics for the body.

    http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.7

    The swift Bulk Delete command affects multiple resources specified in a
    DELETE body.

    http://docs.openstack.org/developer/swift/misc.html#module-swift.common.middleware.bulk

    While Bulk Delete is a welcome operation, its usage of DELETE is
    unusual: affecting multiple resources and relying on reading content.

    More typically, such an operation employs POST (or PUT), which folks
    including api-craft usually agree is the best "catch-all" verb for
    behaviors such as those affecting multiple resources. That's the TL;DR;
    of the thread below.

    https://groups.google.com/forum/#!searchin/api-craft/Regarding$20Bulk$20actions/api-craft/wY-W1NdZDRs/7YDwMhCR608J

    Note that this topic isn't nasal or abstract. The current behavior is
    unsupported using the built-in java http client. Even if third-party
    libraries can work around this behavior, it is probably best to not be a
    snowflake wrt http verb semantics where possible!

    http://stackoverflow.com/questions/9100776/http-delete-with-request-body-issues

    DocImpact

    Closes-Bug: #1232787
    Change-Id: I0fc74c85618fe4dd7ff5e7f9756c7f6f67aa0465

[Diane Fleming (diane-fleming)]

This has already been addressed in the docs: http://docs.openstack.org/api/openstack-object-storage/1.0/content/bulk-delete.html
It's noted that both POST and DELETE work, but DELETE is supported for backward compatibility for bulk-delete.