Added project files

Dockerfile

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+FROM node:18-slim
+WORKDIR /usr/src/app
+COPY package*.json ./
+RUN npm install --only=production
+COPY . .
+EXPOSE 8080
+CMD [ "npm", "start" ]

index.js

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+const express = require('express');
+const { createProxyMiddleware } = require('http-proxy-middleware');
+const cors = require('cors');
+const rateLimit = require('express-rate-limit');
+
+const app = express();
+const PORT = process.env.PORT || 8080;
+
+// CORS middleware
+app.use(cors({
+  origin: true,
+  credentials: true,
+  methods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'],
+  allowedHeaders: ['*']
+}));
+
+// Handle preflight BEFORE proxy
+app.options('*', cors());
+
+// Health check
+app.get('/health', (req, res) => {
+  res.json({ status: 'ok' });
+});
+
+// Rate limiting
+const limiter = rateLimit({
+  windowMs: parseInt(process.env.RATE_LIMIT_WINDOW_MS, 10) || 60_000,
+  max: parseInt(process.env.RATE_LIMIT_MAX, 10) || 100,
+  standardHeaders: true,
+  legacyHeaders: false,
+  message: { error: 'Too many requests, please try again later.' },
+});
+app.use(limiter);
+
+// Require Authorization header
+app.use('/api/v1', (req, res, next) => {
+  const auth = req.headers['authorization'];
+  if (!auth || !auth.startsWith('Bearer ')) {
+    return res.status(401).json({ error: 'Missing or invalid Authorization header.' });
+  }
+  next();
+});
+
+// Request logging
+app.use('/api/v1', (req, res, next) => {
+  const start = Date.now();
+  res.on('finish', () => {
+    const duration = Date.now() - start;
+    console.log(`${req.method} ${req.originalUrl} ${res.statusCode} ${duration}ms`);
+  });
+  next();
+});
+
+// Proxy — only /api/v1/* traffic
+app.use('/api/v1', createProxyMiddleware({
+  target: 'https://openrouter.ai/api/v1',
+  changeOrigin: true,
+  pathRewrite: {
+    '^/api/v1': '',
+  },
+  onProxyReq: (proxyReq, req, res) => {
+    if (!req.headers['http-referer']) {
+      proxyReq.setHeader('HTTP-Referer', 'https://your-app-domain.com');
+    }
+  },
+  onError: (err, req, res) => {
+    console.error(`Proxy error: ${err.message}`);
+    res.status(502).json({ error: 'Bad gateway — upstream request failed.' });
+  },
+  buffer: false,
+}));
+
+// 404 for everything else
+app.use((req, res) => {
+  res.status(404).json({ error: 'Not found. Use /api/v1/* to access the OpenRouter API.' });
+});
+
+app.listen(PORT, () => {
+  console.log(`CORS Proxy running on port ${PORT}`);
+});

package.json

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+{
+  "name": "openrouter-cors-proxy",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js"
+  },
+  "dependencies": {
+    "express": "^4.18.2",
+    "http-proxy-middleware": "^2.0.6",
+    "cors": "^2.8.5",
+    "express-rate-limit": "^7.1.5"
+  }
+}