middleware.ts

import { NextResponse } from "next/server";

import type { NextRequest } from "next/server";

export const config = {
  matcher: [
    "/((?!_next|fonts|examples|api|[\\w-]+\\.\\w+).*)",
  ],
};

export default async function middleware(req: NextRequest) {
  const engyneSubdomain = "mystartup-indigo" // change this to your Engyne subdomain
  const url = req.nextUrl.clone();

  const { pathname } = req.nextUrl;

  const hostname = req.headers.get("host");
  if (!hostname)
    return new Response(null, {
      status: 400,
      statusText: "No hostname found in request headers",
    });

  if (pathname === "/engyne-sitemap.xml") {
    return NextResponse.rewrite(
      new URL(pathname, `https://${engyneSubdomain}.engyne.page`)
    );
  }
  
  if (pathname.startsWith("/blog") || pathname.startsWith("/tags")) {
    return NextResponse.rewrite(
      new URL(pathname, `https://${engyneSubdomain}.engyne.page`)
    );
  }

  if (pathname.startsWith("/_engyne")) {
    return NextResponse.rewrite(
      new URL(pathname, `https://${engyneSubdomain}.engyne.page`)
    );
  }

  return NextResponse.next();
}