fix: fix Invalid URL error when using uppercase i18n url

cypress/integration/middleware/enhanced.spec.ts

@@ -36,4 +36,16 @@ describe('Enhanced middleware', () => {
       expect(response.body).to.have.nested.property('headers.x-geo-timezone')
     })
   })
+
+  it('handles uppercase i18n redirects properly ', () => {
+    cy.visit('/de-DE/static')
+    cy.get('#message').contains('This was static but has been transformed in')
+    cy.contains("This is an ad that isn't shown by default")
+  })
+
+  it('handles lowercase i18n redirects properly ', () => {
+    cy.visit('/de-de/static')
+    cy.get('#message').contains('This was static but has been transformed in')
+    cy.contains("This is an ad that isn't shown by default")
+  })
 })

demos/middleware/next.config.js

@@ -9,7 +9,7 @@ const nextConfig = {
   generateBuildId: () => 'build-id',
   i18n: {
     defaultLocale: 'en',
-    locales: ['en'],
+    locales: ['en', 'de-DE'],
   },
 }
 

jestSetup.js

@@ -1,2 +1,2 @@
-// eslint-disable-next-line n/no-unpublished-require
+ 
 require('jest-fetch-mock').enableMocks()