Comment 4 for bug 1818081

The fix https://review.openstack.org/639805 fixes the /v1/ endpoint from
returning the right "API versions" information. However, version discovery
with the root endpoint (/) is still broken, ex:

  $ curl -i -X GET http://10.10.10.10/share/

  HTTP/1.1 300 Multiple Choices
  Date: Wed, 13 Mar 2019 23:45:25 GMT
  Server: Apache/2.4.29 (Ubuntu)
  Content-Type: application/json
  Content-Length: 748
  X-OpenStack-Manila-API-Version: 2.0
  Vary: X-OpenStack-Manila-API-Version
  Connection: close

  {"versions": [{"status": "DEPRECATED", "updated": "2015-08-27T11:33:21Z", "links": [{"href": "http://docs.openstack.org/", "type": "text/html", "rel": "describedby"}, {"href": "http://10.10.10.10/share/v1/", "rel": "self"}], "min_version": "", "version": "", "media-types": [{"base": "application/json", "type": "application/vnd.openstack.share+json;version=1"}], "id": "v1.0"}, {"status": "CURRENT", "updated": "2015-08-27T11:33:21Z", "links": [{"href": "http://docs.openstack.org/", "type": "text/html", "rel": "describedby"}, {"href": "http://10.10.10.10/share/v2/", "rel": "self"}], "min_version": "2.0", "version": "2.49", "media-types": [{"base": "application/json", "type": "application/vnd.openstack.share+json;version=1"}], "id": "v2.0"}]}

Notice that I did not request the API version 2.0 (X-OpenStack-Manila-API-Version), but the server returns the header "X-OpenStack-Manila-API-Version" set to 2.0. This is wrong, and does not occur with manila configured without a reverse proxy:

  $ curl -i -X GET http://10.10.10.10:8786/
  HTTP/1.1 300 Multiple Choices
  Date: Wed, 13 Mar 2019 23:46:55 GMT
  Server: Apache/2.4.29 (Ubuntu)
  Content-Length: 746
  Connection: close
  Content-Type: application/json

  {"versions": [{"status": "DEPRECATED", "updated": "2015-08-27T11:33:21Z", "links": [{"href": "http://docs.openstack.org/", "type": "text/html", "rel": "describedby"}, {"href": "http://10.10.10.10:8786/v1/", "rel": "self"}], "min_version": "", "version": "", "media-types": [{"base": "application/json", "type": "application/vnd.openstack.share+json;version=1"}], "id": "v1.0"}, {"status": "CURRENT", "updated": "2015-08-27T11:33:21Z", "links": [{"href": "http://docs.openstack.org/", "type": "text/html", "rel": "describedby"}, {"href": "http://10.10.10.10:8786/v2/", "rel": "self"}], "min_version": "2.0", "version": "2.49", "media-types": [{"base": "application/json", "type": "application/vnd.openstack.share+json;version=1"}], "id": "v2.0"}]}

So I'm re-opening this bug.