Add the port to the Host header

Without this, port 80 may be assumed, which would be incorrect.

config/root/etc/nginx/nginx.conf

@@ -103,7 +103,7 @@ http {
         # Authentication and proxying
         location / {
             proxy_pass http://127.0.0.1:8080;
-            proxy_set_header Host localhost;
+            proxy_set_header Host localhost:8080;
             proxy_set_header X-Forwarded-Host $x_forwarded_host;
             proxy_set_header X-Forwarded-Port $x_forwarded_port;
             proxy_set_header X-Forwarded-Proto $x_forwarded_proto;