const { fetch, FormData } = require('undici')
var form = new FormData();
form.append('my_field', 'my value');
form.append('my_buffer', Buffer.from('qweqwe'));
const {
headers,
} = await fetch('https://webhook.site/52b8e471-f5cd-4d71-add3-eefae37d24be', {
method: 'POST',
body: form
})
console.log('headers', headers)