dangfei-api/app/Http/Controllers/IndexController.php

<?php
namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use App\Models\User;

class IndexController extends Controller
{
    /**
     * Create a new AuthController instance.
     *
     * @return void
     */
    public function __construct()
    {
        #这个句是官方提供的，还没有验证是否有效
//        $this->middleware('auth:api', ['except' => ['login']]);
    }

    /**
     * Get a JWT token via given credentials.
     *
     * @param  \Illuminate\Http\Request  $request
     *
     * @return \Illuminate\Http\JsonResponse
     */
    public function index(Request $request)
    {
        return  '请访问http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"].'user/login';
    }
}