fix: make edge function header matching case-insensitive (#7522)

* chore: add test

* fix: make header check case-insensitive

Author: eduardoboucas

src/lib/edge-functions/registry.ts

@@ -422,7 +422,8 @@ export class EdgeFunctionsRegistry {
       }
 
       if (route.headers) {
-        const headerMatches = Object.entries(route.headers).every(([headerName, headerMatch]) => {
+        const headerMatches = Object.entries(route.headers).every(([rawHeaderName, headerMatch]) => {
+          const headerName = rawHeaderName.toLowerCase()
           const headerValueString = Array.isArray(headers[headerName])
             ? headers[headerName].filter(Boolean).join(',')
             : headers[headerName]

tests/integration/__fixtures__/dev-server-with-header-matching-edge-functions/netlify/edge-functions/header-regex.js

@@ -5,6 +5,6 @@ export default async (request) => {
 export const config = {
   path: '/header-regex',
   header: {
-    'x-api-key': '^api-key-\\d+$',
+    'X-API-Key': '^api-key-\\d+$',
   },
 }