app-api/app/Http/Middleware/SetRequestMiddleware.php

<?php
namespace App\Http\Middleware;

use Closure;
use Illuminate\Contracts\Auth\Factory as Auth;
use App\Models\Assit;
use App\Models\AssitLog;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Log;

class SetRequestMiddleware
{
    /**
     * Create a new middleware instance.
     *
     * @return void
     */
    public function __construct(Auth $auth){}

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @param  string|null  $guard
     * @return mixed
     */
    public function handle($request, Closure $next, $guard = null)
    {
        $system=$request->header('system');
//        if(in_array($system,['H5'])){
//            return response()->json([
//                "code"=>41104,
//                "msg"=>'系统维护中。。。',
//                "message"=>'系统维护中。。。',
//                "data"=>'系统维护中。。。'],200);
//        }
        return $next($request);
    }
}