Something and something else middleware

middleware.ts

import { NextRequest, NextResponse } from "next/server";

export default async function middleware(req: NextRequest) {
  const url = req.nextUrl;

  // Get hostname of request (e.g. demo.vercel.pub, demo.localhost:3000)
  const hostname = req.headers.get("host")!
  const path = url.pathname;

  // If you're using the app dir, a request to somethingelse.com/special-somethingelse-page would rewrite to $PROJECT_ROOT/app/somethingelse/special-somethingelse-page/page.tsx
  if (
    hostname === "somethingelse.localhost:3000" || 
    hostname === "somethingelse.com"
  ) {
    return NextResponse.rewrite(new URL(`/somethingelse${path}`, req.url))
  }
  
  // If you're using the app dir, a request to something.com/something-page would rewrite to $PROJECT_ROOT/app/something/special-something-page/page.tsx
  if (
    hostname === "localhost:3000" ||
    hostname === "something.com"
  ) {
    return NextResponse.rewrite(new URL(`/something${path}`, req.url));
  }  

  // Allow all other requests to continue as normal
  return NextResponse.next()
}
 
export const config = {
  matcher: [
    "/((?!api/|_next/|_static/|_vercel|[\\w-]+\\.\\w+).*)",
  ],
};