Add support for nginx 444 default response

The default nginx 444 response drops the inbound connection without
sending any response to the client.

Author: wrouesnel

backend/templates/default.conf

@@ -24,6 +24,12 @@ server {
   }
 {% endif %}
 
+{%- if value == "444" %}
+  location / {
+    return 444;
+  }
+{% endif %}
+
 {%- if value == "redirect" %}
   location / {
     return 301 {{ meta.redirect }};

frontend/js/app/settings/default-site/main.ejs

@@ -18,6 +18,10 @@
                                 <input class="custom-control-input" name="value" value="404" type="radio" required <%- value === '404' ? 'checked' : '' %>>
                                 <div class="custom-control-label"><%- i18n('settings', 'default-site-404') %></div>
                             </label>
+                            <label class="custom-control custom-radio">
+                                <input class="custom-control-input" name="value" value="444" type="radio" required <%- value === '444' ? 'checked' : '' %>>
+                                <div class="custom-control-label"><%- i18n('settings', 'default-site-444') %></div>
+                            </label>
                             <label class="custom-control custom-radio">
                                 <input class="custom-control-input" name="value" value="redirect" type="radio" required <%- value === 'redirect' ? 'checked' : '' %>>
                                 <div class="custom-control-label"><%- i18n('settings', 'default-site-redirect') %></div>

frontend/js/i18n/messages.json

@@ -287,6 +287,7 @@
       "default-site": "Default Site",
       "default-site-congratulations": "Congratulations Page",
       "default-site-404": "404 Page",
+      "default-site-444": "No Response (444)",
       "default-site-html": "Custom Page",
       "default-site-redirect": "Redirect"
     }