我知道这是一个常见的问题，但我已经尝试了相同的问题的解决方案，但无济于事。我只是想使用Webhook从React应用程序向Slack通道发送一条消息，但不知何故，我的输入消息被认为是null/undefined
我的代码：

import React, { useState } from 'react';
import axios from 'axios';
import './App.css';

function App() {
  const [message, setMessage] = useState('');
  async function submitForm(e) {
    e.preventDefault();

    const webhookUrl = 'https://hooks.slack.com/services/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';

    const data = {
        "text": `${message}`,
    }

    let res = await axios.post(webhookUrl, JSON.stringify(data), {
        withCredentials: false,
        transformRequest: [(data, headers) => {
            delete headers.post["Content-Type"]
            return data
        }]
    })

    if (res.status === 200) {
        alert("Message Sent!")

        //clear state so text boxes clear
        setMessage('');
    } else {
        alert("There was an error.  Please try again later.")
    }

}

  return (
    <div className="flex">
      <div className="w-1/2 container mx-auto mt-5">
        <form className="bg-white shadow-md rounded px-8 pt-6 pb-8 mb-4 self-center">
          <label className="block text-gray-700 text-sm font-bold mb-2" htmlFor="message">
            Message
        </label>
          <textarea
            className="appearance-none block w-full bg-gray-200 text-gray-700 border rounded py-3 px-4 mb-3 leading-tight focus:outline-none focus:bg-white"
            id="message"
            type="message"
            placeholder="Write your message here"
            value={message}
            onChange={(e) => { setMessage(e.target.value) }}
          ></textarea>

          <button
            className="mt-4 shadow bg-purple-500 hover:bg-purple-400 focus:shadow-outline focus:outline-none text-white font-bold py-2 px-4 rounded"
            onClick={(e) => submitForm(e)}
          >
            Submit
        </button>
        </form>
      </div>
    </div>
  );
}

export default App;

以下是错误消息

Cannot convert undefined or null to object
TypeError: Cannot convert undefined or null to object
    at axios__WEBPACK_IMPORTED_MODULE_3__.default.post.transformRequest (http://localhost:3000/static/js/bundle.js:41:24)
    at transform (http://localhost:3000/static/js/bundle.js:42455:15)
    at Object.forEach (http://localhost:3000/static/js/bundle.js:44111:10)
    at Object.transformData (http://localhost:3000/static/js/bundle.js:42454:53)
    at Axios.dispatchRequest (http://localhost:3000/static/js/bundle.js:42239:75)
    at Axios.request (http://localhost:3000/static/js/bundle.js:41683:77)
    at Axios.httpMethod [as post] (http://localhost:3000/static/js/bundle.js:41717:19)
    at Function.wrap [as post] (http://localhost:3000/static/js/bundle.js:42816:15)
    at submitForm (http://localhost:3000/static/js/bundle.js:38:67)
    at onClick (http://localhost:3000/static/js/bundle.js:83:25)

我认为问题来自：

JSON.stringify(data)

请帮我一下