Description of problem:

When using haproxy with SSL termination in front of neutron, neutron will return version URL's with http:// prefix instead of https://. This causes API clients to fail.

Version-Release number of selected component (if applicable):

python-neutron-2015.1.0-1.el7

How reproducible:

Steps to Reproduce:
1. Configure HAproxy in front of Neutron with SSL termination (so client talks to neutron over SSL, HAproxy talks to Neutron over plain HTTP)
2. curl https://openstack-api.example.com:9696

Actual results:

{"versions": [{"status": "CURRENT", "id": "v2.0", "links": [{"href": "http://openstack-api.example.com:9696/v2.0", "rel": "self"}]}]}

Expected results:

{"versions": [{"status": "CURRENT", "id": "v2.0", "links": [{"href": "https://openstack-api.example.com:9696/v2.0", "rel": "self"}]}]}

Additional info:

I patched this issue in /usr/lib/python2.7/site-packages/neutron/api/views/versions.py:

def get_view_builder(req):
    base_url = req.application_url
    if req.environ.get('HTTP_X_FORWARDED_PROTO', None) != None:
        base_url = base_url.replace('http://', 'https://')
    return ViewBuilder(base_url)

Then neutron returns the proper https URL. The X-Forwarded-Proto header is inserted by haproxy.

Note: this issue is present in other openstack api's as well but can be worked around by setting public_endpoint explicitly. This option is not available in neutron however.