Comment 3 for bug 1289696

Reviewed: https://review.openstack.org/79358
Committed: https://git.openstack.org/cgit/openstack/oslo-incubator/commit/?id=d7bd9dc37ac3d6bc171cd2e290c772633ad20a32
Submitter: Jenkins
Branch: master

commit d7bd9dc37ac3d6bc171cd2e290c772633ad20a32
Author: Chris Buccella <email address hidden>
Date: Mon Mar 10 14:54:33 2014 +0000

    Don't store the request ID value in middleware as class variable

    The original version of the request_id middleware generates a request ID during
    process_request() and stores the value in a variable, so it can be attached as
    header in process_request(). This is pretty dangerous, since subsequent
    requests will overwrite this value, and the wrong request ID may be attached to
    some responses. This is particularly apparent when requests arrive in parallel.

    This change replaces process_request() and process_response() with an override
    of __call__(). This allows the generated req_id to be used in the response
    header without needing to save it as a class-level variable.

    Change-Id: I498859140ba113412c9d95d09f0c4c6b8650749c
    Closes-bug: #1289696