fix: SSL handshake to backend

Author: batalabs

nginx.conf.template

@@ -49,6 +49,10 @@ http {
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Forwarded-Proto $scheme;
 
+            # SSL/TLS settings for HTTPS upstream
+            proxy_ssl_server_name on;
+            proxy_ssl_name ${BACKEND_HOST};
+
             # WebSocket support
             proxy_set_header Upgrade $http_upgrade;
             proxy_set_header Connection "upgrade";