Netlify NodeJS 函数始终返回“对预检请求的响应未通过”

我正在尝试使用创建一个 API 端点Netlify Lambda 函数。该代码在我的本地运行完美，但总是返回Access to XMLHttpRequest at 'https://<my-netlify-project>.netlify.com/.netlify/functions/submit' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

我正在尝试处理OPTIONS and POST在我的代码中，但它似乎不起作用。这是我的代码：

const axios = require('axios');

const headers = {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Headers': 'Origin, X-Requested-With, Content-Type, Accept',
      'Content-Type': 'application/json',
      'Access-Control-Allow-Methods': '*',
      'Access-Control-Max-Age': 2592000,
      'Access-Control-Allow-Credentials': true,
};

exports.handler = (event, context, callback) => {
      if (event.httpMethod === 'OPTIONS') {
            callback(null, { statusCode: '204', headers });
            return;
      }
      if (event.httpMethod === 'POST') {
            callback(null, {
                  statusCode: 200,
                  body: JSON.stringify({
                        success: true,
                  }),
                  headers,
            });
            return;
      }
};

我试图从 React 应用程序中调用它，使用axios像这样：

axios.post('https://<my-netlify-project>.netlify.com/.netlify/functions/test', reqObj)

我注意到这个错误出现在我的函数调用中

10:24:58 PM: error decoding lambda response: json: cannot unmarshal number into Go value of type string

导致错误的原因是什么以及如何解决？

Cors问题

使用 localhost 的已知问题 https://stackoverflow.com/a/10892392/2597114拨打您的电话。

函数调用时的问题

该问题是由您的标头值引起的。所有值都应该是字符串。回调中的响应期望这些值是字符串。

解码 lambda 响应时出错：json：无法将数字解组为字符串类型的 Go 值

const headers = {
  'Access-Control-Allow-Origin': '*',
  'Access-Control-Allow-Headers': 'Origin, X-Requested-With, Content-Type, Accept',
  'Content-Type': 'application/json',
  'Access-Control-Allow-Methods': '*',
  'Access-Control-Max-Age': '2592000',
  'Access-Control-Allow-Credentials': 'true',
};