Create app.js

app.js

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+// Import required packages for Hugging Face
+import express from 'express';
+import cors from 'cors';
+import fetch from 'node-fetch';
+
+const app = express();
+const PORT = process.env.PORT || 7860; // Hugging Face uses port 7860 by default
+
+// Target API URLs remain the same
+const TARGET_API_URLS = [
+  "https://gpt4fc.deno.dev/zaiwen",
+  "https://gpt4fc2.deno.dev/zaiwen",
+  "https://gpt4fc3.deno.dev/zaiwen",
+  "https://gpt4fc4.deno.dev/zaiwen",
+];
+
+// Middleware setup
+app.use(express.json());
+app.use(cors({
+  origin: '*',
+  methods: ['POST', 'OPTIONS'],
+  allowedHeaders: ['Content-Type', 'Authorization', 'OpenAI-Organization', 'User-Agent']
+}));
+
+// Handler for completions endpoint
+async function handleCompletions(req, res) {
+  try {
+    const requestBody = req.body;
+
+    // Iterate through the target API URLs
+    for (const apiUrl of TARGET_API_URLS) {
+      try {
+        // Forward the request to the target API
+        const headers = {
+          'Content-Type': 'application/json',
+        };
+        
+        // Forward other relevant headers from the original request
+        ['authorization', 'openai-organization', 'user-agent'].forEach(header => {
+          if (req.headers[header]) {
+            headers[header] = req.headers[header];
+          }
+        });
+
+        const response = await fetch(`${apiUrl}/v1/chat/completions`, {
+          method: 'POST',
+          headers: headers,
+          body: JSON.stringify(requestBody)
+        });
+
+        // Check if the target API returned an error
+        if (!response.ok) {
+          console.warn(
+            `Error from target API ${apiUrl}:`,
+            response.status,
+            response.statusText
+          );
+          continue; // Try the next API URL
+        }
+
+        // Get the response from the target API
+        const responseBody = await response.json();
+
+        // Check if the response has content and it's not empty
+        if (
+          responseBody &&
+          responseBody.choices &&
+          responseBody.choices.length > 0 &&
+          responseBody.choices[0].message &&
+          responseBody.choices[0].message.content &&
+          responseBody.choices[0].message.content.trim() !== ""
+        ) {
+          // Return the response to the client
+          return res.status(response.status).json(responseBody);
+        } else {
+          console.warn(`API ${apiUrl} returned empty or invalid content. Trying next API.`);
+          continue; // Try the next API URL
+        }
+      } catch (error) {
+        console.warn(`Error calling API ${apiUrl}:`, error);
+        continue; // Try the next API URL
+      }
+    }
+
+    // If all APIs failed, return an error
+    return res.status(500).send('All APIs failed to return valid content.');
+  } catch (error) {
+    console.error('Error handling /v1/chat/completions:', error);
+    return res.status(500).send('Internal Server Error');
+  }
+}
+
+// Setup routes
+app.post('/v1/chat/completions', handleCompletions);
+
+// Default route
+app.get('/', (req, res) => {
+  res.send('API is running');
+});
+
+// Start the server
+app.listen(PORT, () => {
+  console.log(`Server is running on port ${PORT}`);
+});
+
+// For Hugging Face deployment
+export default app;
+