vhost: Allow setting proxy headers

roles/vhost/defaults/main.yaml

@@ -14,6 +14,7 @@ vhost_basicauth_users: {}
 vhost_proxy_target_netproto: tcp
 vhost_proxy_target_protocol: http
 vhost_proxy_target_host: localhost
+vhost_proxy_headers: {}
 vhost_proxy_delete_headers: []
 vhost_proxy_pass_host_header: true
 

roles/vhost/meta/argument_specs.yaml

@@ -103,6 +103,11 @@ argument_specs:
           - Only applicable if vhost_type is reverse_proxy and vhost_proxy_target_netproto is unix.
         type: str
         required: false
+      vhost_proxy_headers:
+        description: Dict of request headers and their values to set for proxied requests
+        type: dict
+        required: false
+        default: {}
       vhost_proxy_delete_headers:
         description: List of headers to delete from proxied requests
         type: list
@@ -229,6 +234,11 @@ argument_specs:
             type: str
             required: false
             default: "{{ vhost_proxy_target_socket if vhost_type == 'reverse_proxy' and vhost_proxy_target_netproto == 'unix' else '' }}"
+          proxy_headers:
+            description: Dict of request headers and their values to set for proxied requests
+            type: dict
+            required: false
+            default: "{{ vhost_proxy_headers }}"
           proxy_delete_headers:
             description: List of request headers to delete from proxied requests
             type: list

roles/vhost/templates/Caddyfile_block.j2

@@ -33,7 +33,10 @@
           {% for header in location.proxy_delete_headers %}
             header_up -{{ header }}
           {% endfor %}
-          {% if not location.proxy_pass_host_header %}
+          {% for header in location.proxy_headers | dict2items %}
+            header_up {{ header.key }} `{{ header.value }}`
+          {% endfor %}
+          {% if (not location.proxy_pass_host_header) and ('host' not in location.proxy_headers | map('lower')) %}
             header_up Host {upstream_hostport}
           {% endif %}
         }

roles/vhost/vars/main.yaml

@@ -14,6 +14,7 @@ _vhost_location_defaults:
     vhost_type == 'reverse_proxy' and vhost_proxy_target_netproto == 'tcp' else '' }}"
   proxy_target_socket: "{{ vhost_proxy_target_socket if
     vhost_type == 'reverse_proxy' and vhost_proxy_target_netproto == 'unix' else '' }}"
+  proxy_headers: "{{ vhost_proxy_headers }}"
   proxy_delete_headers: "{{ vhost_proxy_delete_headers }}"
   proxy_pass_host_header: "{{ vhost_proxy_pass_host_header }}"