feat: add middleware to proxy requests to external generator (#911)

Author: FajarKim

middleware.ts

@@ -0,0 +1,47 @@
+// Configuration for Vercel Edge Middleware (same as original)
+export const config = {
+  // Matcher: all paths except those starting with /api
+  matcher: ['/((?!api/).*)'],
+};
+
+export default async function middleware(request: Request): Promise<Response | void> {
+  const url = new URL(request.url);
+  const { pathname, search } = url;
+
+  // Additional check to ensure /api paths don't pass through
+  if (pathname.startsWith('/api')) {
+    return; // let the request proceed to the serverless function
+  }
+
+  // Build the target generator URL while preserving the path and query
+  const generatorUrl = new URL(pathname + search, 'https://gh-readme-profile-generator.vercel.app');
+
+  // Prepare headers to forward
+  const headers = new Headers();
+  headers.set('User-Agent', request.headers.get('User-Agent') || '');
+  headers.set('Accept', request.headers.get('Accept') || '*/*');
+  // Do not forward the 'host' header to avoid interference
+
+  try {
+    const response = await fetch(generatorUrl, {
+      method: request.method,
+      headers: headers,
+    });
+
+    // Copy headers from the generator response, except for some unnecessary ones
+    const responseHeaders = new Headers(response.headers);
+    // Remove headers related to connection or original server if needed
+    responseHeaders.delete('content-encoding');
+    responseHeaders.delete('transfer-encoding');
+
+    return new Response(response.body, {
+      status: response.status,
+      statusText: response.statusText,
+      headers: responseHeaders,
+    });
+  } catch (error) {
+    // Handle errors by returning a 500 response or fallback
+    const errorMessage = error instanceof Error ? error.message : 'Unknown error';
+    return new Response('Proxy error: ' + errorMessage, { status: 500 });
+  }
+}

vercel.json

@@ -5,12 +5,6 @@
       "maxDuration": 10
     }
   },
-  "redirects": [
-    {
-      "source": "/",
-      "destination": "https://gh-readme-profile-generator.vercel.app/"
-    }
-  ],
   "headers": [
     {
       "source": "/api",