How can I send a message to a discord webhook through a browser console

I'm trying to make code that can send a message to a discord webhook through a browser console but I can't get it to work

I tried this, as well as some reddit threads and reading the docs

Edit: I also tried using a referrer and origin header with no success

fetch('https://discord.com/api/webhooks/WEBHOOK_ID/WEBHOOK_TOKEN', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    content: 'hello world'
  })
});

I'm getting a POST 400 error but i cant for the life of me figure out why (Yes im using an actual URL when i try the code)

POST https://discord.com/api/webhooks/[ID/TOKEN] 400
(anonymous) @ 00a5b07b3b8bf783d65a.js:153
(anonymous) @ VM234:1

{"message": "Invalid request origin", "code": 50067}

Solution

Discord doesn't allow webhook requests from their own site for security reasons My best guess is that they dont want people to be able to send discord cookies with a webhook