ExtJs Form.submit() response does not have responses json body - json

Question

I have form like
items: [{
xtype: 'form',
itemId: 'form',
bodyPadding: 5,
url: 'upload',
items: [{
xtype: 'fileuploadfield',
name: 'file',
fieldLabel: 'label',
emptyText: 'enter',
labelWidth: 60,
width: 590,
msgTarget: 'side',
allowBlank: false,
buttonText: 'browse'
}],
buttons: [
{
text: 'upload',
itemId: 'loadButton'
}]
}]
and click handler
onLoadBtn: function (button) {
var form = button.up('form').getForm(),
if (form.isValid()) {
form.submit({
scope: this,
submitEmptyText: false,
fileupload:true,
success: function (form, action) {
var response = Ext.JSON.decode(action.response.responseText, true);
if (response.success) {
Ext.Msg.show({
title: 'success',
msg: response.message,
buttons: Ext.Msg.OK,
icon: Ext.Msg.INFO
});
} else {
this.error(response.message);
}
},
failure: function (form, action) {
var response = Ext.JSON.decode(action.response.responseText, true);
this.error(response.message);
},
});
}
},
Endpoint from server side return response with json body
{"success" : "true", "message" : "Success"}
, but in browser network response body is empty.
Request have header
Accept : 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8'
If i change it to
Accept : 'application/json'
and resend request, i got a response with right json body.
Any ideas, what need to change in the form or handler, so that change the accept header?

Answer 1

Resolved. Responses body has been disabled by response header
X-Frame-Options: DENY
Thanks!