chore: add edge function to handle null user agent

Author: qwerzl

netlify/edge-functions/handle-null-ua.ts

@@ -0,0 +1,14 @@
+export default async (request: Request) => {
+  const userAgent = request.headers.get('user-agent') || ''
+
+  if (!userAgent.length) {
+    return new Response('Access Denied: User-Agent is required', {
+      status: 403,
+      headers: {
+        'Content-Type': 'text/plain',
+      },
+    })
+  }
+}
+
+export const config = { path: '/*' }