Merge pull request #3516 from ape-box/kestrelfix

fix nginx template with Connection header to http_connection

plugins/nginx-vhosts/templates/nginx.conf.sigil

@@ -26,7 +26,7 @@ server {
     proxy_pass  http://{{ $.APP }}-{{ $upstream_port }};
     proxy_http_version 1.1;
     proxy_set_header Upgrade $http_upgrade;
-    proxy_set_header Connection "upgrade";
+    proxy_set_header Connection $http_connection;
     proxy_set_header Host $http_host;
     proxy_set_header X-Forwarded-Proto $scheme;
     proxy_set_header X-Forwarded-For $remote_addr;