<?php

namespace App\Http\Middleware;

use Illuminate\Support\Collection;

class AddPreconnectLink
{
    /**
     * Handle the incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return \Illuminate\Http\Response
     */
    public function handle($request, $next)
    {
        return tap($next($request), function ($response) {
            if (config('preconnect') !== []) {
                $response->header('Link', Collection::make(config('preconnect'))
                    // ->map(fn ($url) => "<{$url}>; " . 'rel="preload"; as=font; type="font/woff2"; crossorigin')
                    ->map(fn ($url) => "<{$url}>; " . 'rel="preconnect"')
                    ->join(', ')
                    .', <https://code.jquery.com/jquery-3.3.1.min.js>;rel="preload";as="script";crossorigin;nopush'
                    ,
                    false
                );
            }
        });
    }
}
https://code.jquery.com/jquery-3.3.1.min.js