rag/app/Http/Middleware/AssignTraceId.php

<?php

namespace App\Http\Middleware;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Context;
use Illuminate\Support\Str;
use Symfony\Component\HttpFoundation\Response;

class AssignTraceId {
    public function handle(Request $request, \Closure $next) {
        $traceId = Str::orderedUUid()->toString();

        Context::add('x-trace-id', $traceId);

        $response = $next($request);

        $response->headers->set('X-Trace-Id', $traceId);

        return $response;
    }
}