[node] Handle multi-protocol in Edge Functions (#9502)

Co-authored-by: Chris Barber <chris.barber@vercel.com>
Co-authored-by: Sean Massa <EndangeredMassa@gmail.com>
fix #9501

packages/node/src/edge-functions/edge-handler-template.js

@@ -2,7 +2,7 @@
 /* global addEventListener */
 
 function buildUrl(requestDetails) {
-  let proto = requestDetails.headers['x-forwarded-proto'];
+  let proto = requestDetails.headers['x-forwarded-proto'].split(/\b/).shift(); // handling multi-protocol like https,http://...
   let host = requestDetails.headers['x-forwarded-host'];
   let path = requestDetails.url;
   return `${proto}://${host}${path}`;

packages/node/test/unit/edge-functions/edge-handler-template.test.ts

@@ -17,6 +17,17 @@ describe('edge-handler-template', () => {
       });
       expect(url).toBe('https://somewhere.com/api/add');
     });
+
+    test('works with multi proto', async () => {
+      const url = buildUrl({
+        url: '/api/add',
+        headers: {
+          'x-forwarded-proto': 'https,http',
+          'x-forwarded-host': 'somewhere.com',
+        },
+      });
+      expect(url).toBe('https://somewhere.com/api/add');
+    });
   });
 
   describe('respond()', () => {