vhost: Support manipulating headers

roles/vhost/tasks/caddy.yml

@@ -8,6 +8,9 @@
       {{ vhost_domains | join(' ') }} {
         {% for location in vhost_locations_all %}
         handle {{ location.path }} {
+          {% for header in location.delete_headers %}
+          header -{{ header }}
+          {% endfor %}
           {% for header in location.headers | dict2items %}
           header {{ header.key }} `{{ header.value }}`
           {% endfor %}
@@ -26,6 +29,9 @@
             }
             {% endif %}
           }
+          {% for header in location.proxy_delete_headers %}
+          request_header -{{ header }}
+          {% endfor %}
           {% elif location.type == 'redirect' %}
           redir {{ location.redirect_target }}{{ '{uri}' if location.redirect_preserve_path }} {{ location.redirect_type }}
           {% elif location.type == 'respond' %}