added X-Forwarded-Proto header

docs/configuring-playbook-own-webserver.md

@@ -297,6 +297,7 @@ server {
         proxy_set_header Host $host;
         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;
         client_max_body_size 0;
 
         # Websocket
@@ -338,6 +339,7 @@ server {
 
                 proxy_set_header Host $host;
                 proxy_set_header X-Forwarded-For $remote_addr;
+				proxy_set_header X-Forwarded-Proto $scheme;
 
                 proxy_http_version 1.1;
                 proxy_set_header Upgrade $http_upgrade;