laravel5.5 401 error

Laravel 5.5 401 error: how to solve it?

Laravel is a very popular PHP framework that improves the efficiency of web application development. However, you may encounter 401 errors when using Laravel. This error is usually caused by failed authentication or an expired session, but it can be caused by other reasons. This article will explain how to resolve Laravel 5.5 401 errors.

1. Check Authentication

First, check that your authentication is correct. In Laravel, you can use many authentication methods, such as using Laravel's own Auth facade or using Laravel Passport for OAuth authentication. Make sure you have completed your identity verification before submitting your request.

For example, if you use the Auth facade to authenticate your users, be sure to use auth middleware to authenticate their access. You can use it in your route definition like this:

Route::get('/dashboard', ['middleware' => ['auth'], function () {
    // 此处为您的代码
}]);

2. Check Route

Check if your route is correct. If the routing is incorrect, error code 401 will be returned. Make sure your routes are defined correctly and match your controllers and methods. You can view your routes in a browser or using the command "php artisan route:list" in a terminal.

3. Check CSRF protection

Laravel enables CSRF protection by default to prevent cross-site request attacks. If your application uses POST, PUT, or DELETE requests, you must include the CSRF token in the request. If you don't include the CSRF token, a 401 error will be returned.

To solve this problem, you can use the @csrf directive in Laravel or add the CSRF token to the request when sending the AJAX request. For example, for AJAX requests, you can add the following code to your JavaScript file:

$.ajaxSetup({
       headers: {
           'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
       }
});

4. Check for Cross-Origin Resource Sharing (CORS)

If you are using Laravel 5.5 or later, and using API routing, you may encounter CORS issues. Cross-Origin Resource Sharing (CORS) is a mechanism between web browsers and web servers that allows web pages to request resources from one domain to another domain. If CORS is not configured correctly, the browser will stop the request and return a 401 error.

To solve this problem, you can use barryvdh/laravel-cors extension in Laravel. This extension will allow you to customize CORS rules and resolve CORS issues in your Laravel application.

5. Check Session

Finally, check to see if your session has expired. If the session has expired, your application will not be able to authenticate the user and return a 401 error. In Laravel, the session manager uses cookies to track user sessions, so if the user closes their web browser, the session may expire immediately. The expiration time of the session manager can be configured in config/session.php.

The same problem may occur if a user suddenly accesses your application after a long period of inactivity. This situation can be solved by configuring the "lifetime" and "expire_on_close" options in config/session.php.

Summary

401 error can be one of the common errors in Laravel applications. Any of the above situations may result in a 401 error. So if you encounter a 401 error, make sure to check aspects such as authentication, routing, CSRF protection, CORS, and sessions to find the problem. Once you discover the problem, you can easily fix it and ensure your Laravel application is working properly.

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