Cors 部分情况下失效

项目使用了 dingo/api，发现在抛出某些异常后没有自动支持 cors，跨域访问报错：

XMLHttpRequest cannot load http://localhost:91/login. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not allowed access.

可能是 cors 中间件没有对所有异常做处理，解决办法，修改 config/api.php：

<?php

return [

    'middleware' => [
        'palanik\lumen\Middleware\LumenCors'
    ]

];

https://github.com/dingo/api/issues/876
https://github.com/dingo/api/issues/930