Extra headers added to form submit do not work

Hi,



I need to add extra headers to be sent with standard form submission to pass a basic http authentication token.



On this page http://ift.tt/1jw17kU I have learned that I should use:



form.submit{

url: ......

headers: {Authorization: ...}

}



but whatever I try no extra headers are sent.



I have not been able to find any example of adding extra headers to form submit.

How can I do it?



For Ajax requests this works:



Ext.Ajax.defaultHeaders = {Authorization: make_basic_auth(username, password)};



however, a form submit cannot be done via Ajax.