Fixing an issue found with nginx + minio.

hosting/nginx.dev.conf.hbs

@@ -76,6 +76,7 @@ http {
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       proxy_set_header X-Forwarded-Proto $scheme;
+      proxy_set_header Host $http_host;
 
       proxy_connect_timeout 300;
       proxy_http_version 1.1;
@@ -91,4 +92,4 @@ http {
     gzip                  off;
     gzip_comp_level       4;
   }
-}
+}