@@ -0,0 +1,17 @@
+import { matchNextDataPathname } from './match-next-data-pathname'
+
+describe('matchNextDataPathname', () => {
+  it('matches the exact internal route', () => {
+    expect(matchNextDataPathname('/_next/data/build-id/index.json')).toEqual({
+      path: ['build-id', 'index.json'],
+    })
+  })
+
+  it.each([
+    '/_NEXT/data/build-id/index.json',
+    '/_next/DATA/build-id/index.json',
+    '/_NeXt/DaTa/build-id/index.json',
+  ])('does not match a case variant: %s', (pathname) => {
+    expect(matchNextDataPathname(pathname)).toBe(false)
+  })
+})
@@ -1,6 +1,6 @@
 import { getPathMatch } from '../../shared/lib/router/utils/path-match'
 
-const matcher = getPathMatch('/_next/data/:path*')
+const matcher = getPathMatch('/_next/data/:path*', { sensitive: true })
 
 export function matchNextDataPathname(pathname: string | null | undefined) {
   if (typeof pathname !== 'string') return false