POST error: Invalid transport

API
3

Hello, pls , help me too. I make:

 method: 'POST',
  url: 'https://api.twitch.tv/helix/eventsub/subscriptions',
  headers:
   { 'Client-ID': '{{MY_CLIENT_ID}}',
     Authorization: 'Bearer {{APP_AUTH_TOKEN}}' },
  responseType: 'text',
  data: '{{challenge}}'

But response is :

{
  "error": "Bad Request",
  "status": 400,
  "message": "invalid transport"
}