fix

default.conf

@@ -1,6 +1,13 @@
 
 events {}
 error_log /dev/stdout info;
+
+# Upgrade WebSocket if requested, otherwise use keepalive
+map $http_upgrade $connection_upgrade_keepalive {
+    default upgrade;
+    ''      '';
+}
+
 http {
     access_log /dev/stdout;
     server {
@@ -23,8 +30,8 @@ http {
 
 	    location / {
             proxy_pass "$PROXY_HOST";  # Replace with your local IP address
-            proxy_set_header Upgrade "upgrade";
-            proxy_set_header Connection "upgrade";
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection $connection_upgrade_keepalive;
             proxy_set_header Host $host;
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;