Refactor middleware.ts to remove unnecessary code and fix header manipulation

Author: marcinciarka

middleware.ts

@@ -2,15 +2,6 @@ import type { NextRequest } from 'next/server'
 import { NextResponse } from 'next/server'
 import { handleRewrite } from 'server/rewrites'
 
-function getRandomishId() {
-  const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
-  let result = ''
-  for (let i = 0; i < 10; i++) {
-    result += chars.charAt(Math.floor(Math.random() * chars.length))
-  }
-  return result
-}
-
 export function middleware(request: NextRequest) {
   const allowedOrigins = process.env.ALLOWED_ORIGINS?.split(',') || []
 
@@ -22,8 +13,10 @@ export function middleware(request: NextRequest) {
 
   const response = NextResponse.next()
   const origin = request.headers.get('origin') || ''
-  const userAgentHeader = request.headers.get('user-agent') || ''
-  request.headers.set('user-agent', `${userAgentHeader} Summer.fi/${getRandomishId()}`)
+
+  if (request.headers.get('x-now-route-matches')) {
+    request.headers.delete('x-now-route-matches')
+  }
 
   // If the origin is in the ALLOWED_ORIGINS env, add it to the Access-Control-Allow-Origin header
   if (allowedOrigins.includes(origin)) {