Use relative redirects, as suggsted in #272

nginx/conf/nginx.conf

@@ -17,6 +17,7 @@ http {
     sendfile on;
     keepalive_timeout  65;
     server_tokens off;
+    absolute_redirect off;
 
     server {
       listen 80;
@@ -58,7 +59,7 @@ http {
 
       {% if ADMIN == 'true' %}
       location {{ WEB_ADMIN }} {
-        return 301 $scheme://$host{{ WEB_ADMIN }}/ui;
+        return 301 {{ WEB_ADMIN }}/ui;
       }
       location ~ {{ WEB_ADMIN }}/(ui|static) {
         rewrite ^{{ WEB_ADMIN }}/(.*) /$1 break;