我是一个前端是React JS，后端是Laravel的应用程序。这两个都是使用Plesk部署的。我已经在Laravel后端设置了所有必要的配置来处理CORS问题。但它仍然给CORS错误。
下面是laravel后端的config文件夹中的cors.php文件的内容。

return [

    /*
    |--------------------------------------------------------------------------
    | Cross-Origin Resource Sharing (CORS) Configuration
    |--------------------------------------------------------------------------
    |
    | Here you may configure your settings for cross-origin resource sharing
    | or "CORS". This determines what cross-origin operations may execute
    | in web browsers. You are free to adjust these settings as needed.
    |
    | To learn more: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
    |
    */

    'paths' => ['*'],
    'allowed_methods' => ['*'],

    'allowed_origins' => ['url_of_react_app'],

    'allowed_origins_patterns' => ['*'],

    'allowed_headers' => ['*'],
    'exposed_headers' => [],
    'max_age' => 0,
    'supports_credentials' => false,

];

它仍然抛出CORS错误。Laravel后端和react应用程序都是通过https进行的。CORS错误是这样的。
CORS策略已阻止从源“URL_of_React_app”访问“URL_of_laravel_backend”处的XMLHttpRequest：对印前检查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。
React app中的API配置是这样的

import axios from "axios";

export const baseURL = "URL_of _laravel_backend";
export const axiosPublicInstance = axios.create({
  baseURL,
  headers: {
    "Content-Type": "application/json",
    "Access-Control-Allow-Origin": "*"
  },
});