Default content type to text/plain;charset=UTF-8 with ajaxConfig

[yamsellem]

Is there a reason why body are send by default with a Content-Type to text/plain;charset=UTF-8?
This is very painful.

Ok, this is on my side too.
Using ajaxConfig is the reason of this, but I can't find why.

ajaxConfig: {
  beforeSend: function(xhr) {
    xhr.open(this.type, this.url + `?token=...`, true);
  },

[yamsellem]

Not related to ampersand-model.
I'll post the solution here when I find it.

[yamsellem]

This is enough to fix the problem;

ajaxConfig: {
  beforeSend: function(xhr) {
    xhr.open(this.type, this.url + `?token=...`, true);
    Object.keys(xhr.headers).forEach(header => {
      xhr.setRequestHeader(header, xhr.headers[header]);
    });
  },