Creates middleware to pass the site's current domain via headers

x-current-domain-middleware.ts

import { NextFetchEvent, NextRequest, NextResponse } from "next/server";
import { CustomMiddleware } from "./chain";

export function xCurrentDomain(middleware: CustomMiddleware) {
    return async (req: NextRequest, ev: NextFetchEvent) => {
        const headers = new Headers(req.headers);
        headers.set("x-current-domain", req.nextUrl.origin);
        const response = NextResponse.next({
            request: {
                headers,
            },
        });
        return middleware(req, ev, response);
    };
}