问题描述

XMLHttpRequest 无法加载 http://myapi/api/rating.对预检请求的响应未通过访问控制检查:请求的资源上不存在Access-Control-Allow-Origin"标头.Origin 'http://localhost:8104' 因此不允许访问.响应的 HTTP 状态代码为 403.

XMLHttpRequest cannot load http://myapi/api/rating. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8104' is therefore not allowed access. The response had HTTP status code 403.

我不明白为什么我不能发出 CORS 请求.我已经在这里安装了中间件，将它添加到全局http内核中，但它仍然不起作用.尝试根据 stackoverflow 建议创建自定义中间件，但这也不起作用.还尝试添加一个路由组.最后，我尝试在请求操作中手动设置响应标头.我真的被困住了 - 感谢帮助！

I can't figure out why I can't make CORS requests. I've install the middleware here, added it to the global http kernel, but it still doesn't work. Tried to create a custom middleware given stackoverflow suggestions but that also did not work. Also tried adding a Route group. Lastly, I tried setting the response headers manually in the request action. I'm really stuck - help is appreciated!

查看代码:https://gist.github.com/KerryRitter/0d7ababb7b9eb8d54f0ae55

推荐答案

如果你使用的是 Laravel 5.5 &Laravel 5.x 并面临同样的问题，如请求的资源上不存在Access-Control-Allow-Origin"标头.只需使用以下软件包并配置您的系统.

If you are using Laravel 5.5 & Laravel 5.x and facing same problem like No 'Access-Control-Allow-Origin' header is present on the requested resource. Just use following package and config your system.

第 1 步:

composer require barryvdh/laravel-cors

第 2 步

您还需要将 CorsServiceProvider 添加到您的 config/app.php providers 数组:

You also need to add CorsServiceProvider to your config/app.php providers array:

FruitCakeCorsCorsServiceProvider::class,

要允许所有路由使用 CORS，请在 app/Http/Kernel 的 $middleware 属性中添加 HandleCors 中间件.php 类:

To allow CORS for all your routes, add the HandleCors middleware in the $middleware property of app/Http/Kernel.php class:

供全球使用:

protected $middleware = [
    // ...
    FruitcakeCorsHandleCors::class,
];

中间件用途:

protected $middlewareGroups = [
   'web' => [
       // ...
   ],

   'api' => [
        // ...
        FruitcakeCorsHandleCors::class,
    ],
];

第三步

安装完成后，运行以下命令以发布供应商文件.

Once your installation completed run below command to publish the vendor files.

php artisan vendor:publish --provider="FruitcakeCorsServiceProvider"

希望这个回答能帮助和我一样面临同样问题的人.

Hope this answer helps someone facing the same problem as myself.

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