VolleyError UnsupportedOperationException

I tried it with the headers "Authorization", "authorization" and "test" and i got always the UnsupportedOperationException.
Here a code to test it. You maybe need to create the endpoit, for that go to the page "https://ptsv2.com" and there you can create you a new endpoint.

const http = require('http');

setWatch(() => {
  E.showMessage('Start sending');
  Bangle.http(`https://ptsv2.com/t/bangleD­ump/post`, {
    headers: {test: 'Basic dGVzdDp0ZXN0'},
    method: 'POST',
    body: JSON.stringify({test: 1}, null, 2)
  }).then((response) => JSON.parse(response.resp)).catch((err) => {
    E.showMessage('fail ' + JSON.stringify(err));
    return Promise.reject(err);
  }).then((res) => {
    E.showMessage('Send Success');
  });
}, BTN1, {repeat: true, edge: "falling"});