Glance server ignores Accept-Encoding

[Flavio Percoco]

Glance server doesn't compress responses even thought the request correctly sends Accept-Encoding.

$ glance --debug image-list
curl -i -X GET -H 'X-Auth-Token: aca2aa0abfb347fe8b807034baa32ddb' -H 'Accept-Encoding: gzip, deflate, compress' -H 'Accept: */*' -H 'User-Agent: python-glanceclient' -H 'Content-Type: application/octet-stream' http://192.168.25.25:9292http://192.168.25.25:9292//v1/images/detail?sort_key=name&sort_dir=asc&limit=20

HTTP/1.1 200 OK
date: Wed, 06 Mar 2013 20:47:44 GMT
content-length: 2267
content-type: application/json; charset=UTF-8
x-openstack-request-id: req-2091d29f-8afd-4bd7-86a4-e12829fdd6c0

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/23739

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/27622

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/27622
Committed: http://github.com/openstack/glance/commit/0a4f4aff6c0ef7b74492dab6a88a2f4e40a3a422
Submitter: Jenkins
Branch: master

commit 0a4f4aff6c0ef7b74492dab6a88a2f4e40a3a422
Author: Flaper Fesp <email address hidden>
Date: Sat Apr 27 14:42:15 2013 +0200

    Compress response's content according to client's accepted encoding

    Currently Glance ignores the Accept-Encoding header and returns
    responses as they are regardless the client accepts gzip or other type
    of compression.

    This patch adds this capability to glance (by using a middleware)
    supporting just gzip for now.

    Important note:
        - The patch uses a lazy compression for Content-Type
        application/octet-stream but in order to do that, the
        content-length has to be unset which means that when an image is
        downloaded the content-length will be unknown to the client.

    Fixes bug: 1150380

    Change-Id: Ieb65837d4e3fe310f97d9666882ecc572b14956a