Unexpected response from new microversioned API

Update: This issue can be reproduced with any new APIs that enforce micro-version (for example /stats API and /quotas API)

Since the microversion for the "PATCH /certificates/{cluster_id}" API was introduced in a65ef7d3c, it has been necessary to pass the OpenStack-API-Version header on the initial request to any certificates API for a particular cluster. There may be a bug in the way microversions are handled in Magnum.

Example:

$ . /etc/sysconfig/heat-params
$ auth_json=$(cat << EOF
> {
> "auth": {
> "identity": {
> "methods": [
> "password"
> ],
> "password": {
> "user": {
> "id": "$TRUSTEE_USER_ID",
> "password": "$TRUSTEE_PASSWORD"
> }
> }
> },
> "scope": {
> "OS-TRUST:trust": {
> "id": "$TRUST_ID"
> }
> }
> }
> }
> EOF
> )
$ AUTH_URL=${AUTH_URL/v2.0/v3}
$ content_type='Content-Type: application/json'
$ url="$AUTH_URL/auth/tokens"
$ USER_TOKEN=`curl -k -s -i -X POST -H "$content_type" -d "$auth_json" $url \
> | grep X-Subject-Token | awk '{print $2}' | tr -d '[[:space:]]'`
$ curl -k -X GET \
> -H "X-Auth-Token: $USER_TOKEN" \
> $MAGNUM_URL/certificates/$CLUSTER_UUID
{"errors": [{"status": 406, "code": "", "links": [], "title": "", "detail": "", "request_id": ""}]}

The "GET /certificates/{cluster_id}" API has no explicit microversion, so "container-infra 1.1" should be implied. If a client doesn't specify a microversion, the default used is 1.1. So we shouldn't have recieved a 406.

If we send a microversion, that request and every subsequent request (no matter the microversion sent) results in a 200 OK.

Works with microversion:

$ curl -k -X GET -H "OpenStack-API-Version: container-infra latest" -H "X-Auth-Token: $USER_TOKEN" $MAGNUM_URL/certificates/$CLUSTER_UUID
{"cluster_uuid": "52bf1b29-cfdd-405d-9d29-3a3b0532070c", "pem": "-----BEGIN CERTIFICATE-----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\nsGDci56UQkjvTQZ5Bp3lkNwU\n-----END CERTIFICATE-----\n", "bay_uuid": "52bf1b29-cfdd-405d-9d29-3a3b0532070c", "links": [{"href": "http://65.61.144.174:9511/v1/certificates/52bf1b29-cfdd-405d-9d29-3a3b0532070c", "rel": "self"}, {"href": "http://65.61.144.174:9511/certificates/52bf1b29-cfdd-405d-9d29-3a3b0532070c", "rel": "bookmark"}]}

But now it works without the microversion too:

$ curl -k -X GET -H "X-Auth-Token: $USER_TOKEN" $MAGNUM_URL/certificates/$CLUSTER_UUID
{"cluster_uuid": "52bf1b29-cfdd-405d-9d29-3a3b0532070c", "pem": "-----BEGIN CERTIFICATE-----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\nsGDci56UQkjvTQZ5Bp3lkNwU\n-----END CERTIFICATE-----\n", "bay_uuid": "52bf1b29-cfdd-405d-9d29-3a3b0532070c", "links": [{"href": "http://65.61.144.174:9511/v1/certificates/52bf1b29-cfdd-405d-9d29-3a3b0532070c", "rel": "self"}, {"href": "http://65.61.144.174:9511/certificates/52bf1b29-cfdd-405d-9d29-3a3b0532070c", "rel": "bookmark"}]}