Enable proxy headers parsing

Automatically enable the proxy headers parsing middleware so Glance
can detect X-Forwarded-Proto when SSL is terminated at the load
balancer.

Change-Id: I4510749b1a4198834b9006a823f18edb48710460

defaults/main.yml

@@ -122,6 +122,10 @@ glance_service_internalurl: "{{ glance_service_internaluri }}"
 glance_service_adminuri: "{{ glance_service_adminuri_proto }}://{{ internal_lb_vip_address }}:{{ glance_service_port }}"
 glance_service_adminurl: "{{ glance_service_adminuri }}"
 
+## Enable automatic parsing of X-Forwarded-Proto, etc. headers passed by the
+## load balancer.
+glance_proxy_headers_parsing: True
+
 ## Swift Options
 glance_swift_store_auth_address: "{{ keystone_service_internalurl }}"
 glance_swift_store_auth_insecure: "{{ keystone_service_internaluri_insecure }}"

templates/glance-api.conf.j2

@@ -110,3 +110,8 @@ rbd_store_chunk_size = {{ glance_rbd_store_chunk_size }}
 
 [profiler]
 enabled = {{ glance_profiler_enabled }}
+
+{% if glance_proxy_headers_parsing | bool %}
+[oslo_middleware]
+enable_proxy_headers_parsing = True
+{% endif %}