fix express proxy headers

README.md

@@ -120,17 +120,14 @@ docker compose up -d
 
 When running ExcaliDash behind Traefik, Nginx, or another reverse proxy, configure both containers so that API + WebSocket calls resolve correctly:
 
-- `FRONTEND_URL` (backend) must match the public URL that users hit (e.g. `https://excalidash.example.com`). This controls CORS and Socket.IO origin checks. **Supports multiple comma-separated URLs** for accessing from different addresses.
+- `FRONTEND_URL` (backend) must match the public URL that users hit (e.g. `https://excalidash.example.com`). This controls CORS and Socket.IO origin checks.
 - `BACKEND_URL` (frontend) tells the Nginx container how to reach the backend from inside Docker/Kubernetes. Override it if your reverse proxy exposes the backend under a different hostname.
 
 ```yaml
 # docker-compose.yml example
 backend:
   environment:
-    # Single URL
     - FRONTEND_URL=https://excalidash.example.com
-    # Or multiple URLs (comma-separated) for local + network access
-    # - FRONTEND_URL=http://localhost:6767,http://192.168.1.100:6767,http://nas.local:6767
 frontend:
   environment:
     # For standard Docker Compose (default)

VERSION

@@ -1 +1 @@
-0.3.2
+0.3.1

backend/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "backend",
-  "version": "0.3.2",
+  "version": "0.3.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "backend",
-      "version": "0.3.2",
+      "version": "0.3.1",
       "license": "ISC",
       "dependencies": {
         "@prisma/client": "^5.22.0",
@@ -3286,9 +3286,9 @@
       }
     },
     "node_modules/lodash": {
-      "version": "4.17.23",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.23.tgz",
-      "integrity": "sha512-LgVTMpQtIopCi79SJeDiP0TfWi5CNEc/L/aRdTh3yIvmZXTnheWpKjSZhnvMl8iXbC1tFg9gdHHDMLoV7CnG+w==",
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
       "license": "MIT"
     },
     "node_modules/lru-cache": {

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "backend",
-  "version": "0.3.2",
+  "version": "0.3.1",
   "description": "",
   "main": "index.js",
   "scripts": {

backend/src/__tests__/csrf-trust-proxy.test.ts

@@ -51,13 +51,12 @@ describe("Issue #38: CSRF with trust proxy settings", () => {
       .set("X-Forwarded-For", "203.0.113.42, 10.0.0.5, 172.17.0.3")
       .set("User-Agent", "Mozilla/5.0 Test");
 
-    // With trust proxy: 1 in supertest (no real socket), Express takes the last IP
-    // In production with a real connection, behavior differs - the key point is it's NOT the client IP
-    expect(response1.body.ip).toBe("172.17.0.3");
+    // With trust proxy: 1, Express takes second-to-last IP (the external proxy)
+    expect(response1.body.ip).toBe("10.0.0.5");
     console.log(
       "trust proxy: 1 → IP:",
       response1.body.ip,
-      "(not the real client IP)",
+      "(external proxy IP - WRONG)",
     );
 
     // With trust proxy: true
@@ -161,12 +160,10 @@ describe("Issue #38: CSRF with trust proxy settings", () => {
     });
 
     // Client -> Synology (192.168.1.x) -> Docker frontend (192.168.11.x) -> Backend
-    // In supertest without real socket, trust proxy: 1 returns last IP
-    // Key point: it's NOT the real client IP (192.168.0.100)
     await request(app)
       .get("/test")
       .set("X-Forwarded-For", "192.168.0.100, 192.168.1.4, 192.168.11.166");
     console.log("  With trust proxy: 1, Express sees:", seenIp);
-    expect(seenIp).toBe("192.168.11.166"); // Not the real client IP
+    expect(seenIp).toBe("192.168.1.4"); // Proxy IP, not client IP
   });
 });

frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "frontend",
   "private": true,
-  "version": "0.3.2",
+  "version": "0.3.1",
   "type": "module",
   "scripts": {
     "dev": "vite",