added the proxy common conf which has everything needed in server blocks of prioxies

conf.d/proxy-common.conf

@@ -0,0 +1,27 @@
+# Set headers for proxied requests
+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;
+
+# WebSocket support
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    ''      close;
+}
+
+# Proxy buffering
+proxy_http_version 1.1;
+proxy_set_header Upgrade $http_upgrade;
+proxy_set_header Connection $connection_upgrade;
+proxy_buffering off;
+proxy_cache_bypass $http_upgrade;
+
+# Timeouts
+proxy_connect_timeout 10s;
+proxy_send_timeout 60s;
+proxy_read_timeout 3600s; # long-lived websocket connections
+
+# limits
+limit_req zone=req_limit burst=10 nodelay;
+limit_conn zone=conn_limit 10;