Match subrequest handling for edge and node

Author: ijjk

packages/next/server/next-server.ts

@@ -248,11 +248,6 @@ export default class NextNodeServer extends BaseServer {
       )
     }
 
-    const randomBytes = crypto.randomBytes(8)
-    const middlewareSubrequestId = randomBytes.toString('hex')
-    ;(global as any)[Symbol.for('@next/middleware-subrequest-id')] =
-      middlewareSubrequestId
-
     if (!options.dev) {
       // pre-warm _document and _app as these will be
       // needed for most requests

packages/next/server/web/sandbox/context.ts

@@ -218,15 +218,6 @@ Learn More: https://nextjs.org/docs/messages/edge-dynamic-code-evaluation`),
         }
 
         init.headers = new Headers(init.headers ?? {})
-        const prevs =
-          init.headers.get(`x-middleware-subrequest`)?.split(':') || []
-        const value = prevs.concat(options.moduleName).join(':')
-
-        init.headers.set('x-middleware-subrequest', value)
-        init.headers.set(
-          'x-middleware-subrequest-id',
-          (global as any)[Symbol.for('@next/middleware-subrequest-id')]
-        )
 
         if (!init.headers.has('user-agent')) {
           init.headers.set(`user-agent`, `Next.js Middleware`)

packages/next/server/web/sandbox/sandbox.ts

@@ -70,24 +70,6 @@ export const getRuntimeContext = async (params: {
 
 export const run = withTaggedErrors(async (params) => {
   const runtime = await getRuntimeContext(params)
-  const subreq = params.request.headers[`x-middleware-subrequest`]
-  const subrequests = typeof subreq === 'string' ? subreq.split(':') : []
-  if (
-    // require the subrequest-id be valid to skip
-    params.request.headers['x-middleware-subrequest-id'] ===
-      (global as any)[Symbol.for('@next/middleware-subrequest-id')] &&
-    subrequests.includes(params.name)
-  ) {
-    return {
-      waitUntil: Promise.resolve(),
-      response: new runtime.context.Response(null, {
-        headers: {
-          'x-middleware-next': '1',
-        },
-      }),
-    }
-  }
-
   const edgeFunction: (args: {
     request: RequestData
   }) => Promise<FetchEventResult> =

test/e2e/middleware-general/test/index.test.ts

@@ -71,24 +71,6 @@ describe('Middleware Runtime', () => {
   }
 
   function runTests({ i18n }: { i18n?: boolean }) {
-    it('should filter request header properly', async () => {
-      const res = await fetchViaHTTP(
-        next.url,
-        '/redirect-to-somewhere',
-        {},
-        {
-          headers: {
-            'x-middleware-subrequest':
-              'middleware:middleware:middleware:middleware:middleware',
-          },
-          redirect: 'manual',
-        }
-      )
-
-      expect(res.status).toBe(307)
-      expect(res.headers.get('location')).toContain('/somewhere')
-    })
-
     if ((global as any).isNextDev) {
       it('refreshes the page when middleware changes ', async () => {
         const browser = await webdriver(next.url, `/about`)