Some tyhigns.

client/server.js

@@ -1,5 +1,6 @@
 const express = require("express");
 const path = require("path");
+const fs = require("fs");
 const isDev = process.env.NODE_ENV !== "production";
 let livereload, connectLivereload;
 if (isDev) {
@@ -8,6 +9,19 @@ if (isDev) {
 }
 const app = express();
 const PORT = 3000;
+const DOMAIN_FILE = path.join(__dirname, "domain.txt");
+
+function readWsDomain() {
+  try {
+    const val = fs.readFileSync(DOMAIN_FILE, "utf8").trim();
+    if (val) return val;
+  } catch (err) {
+    if (err.code !== "ENOENT") {
+      console.warn("Failed to read domain.txt:", err.message);
+    }
+  }
+  return process.env.WS_DOMAIN || "localhost:8080";
+}
 
 if (isDev) {
   const liveReloadServer = livereload.createServer();
@@ -17,6 +31,10 @@ if (isDev) {
 
 app.use(express.static("public"));
 
+app.get("/ws-domain", (_req, res) => {
+  res.json({ domain: readWsDomain() });
+});
+
 app.get("/", (req, res) => {
   res.sendFile(path.join(__dirname, "public", "index.html"));
 });