I am developing an application where I would like to allow my setRequestHeader to accept all file types. I'm trying to send via POST two input values, one of the text type and the other of the file type, but I'm only allowing one of the two.

my code:

 var xml = new XMLHttpRequest();
 xml.open("POST", url, true);
 xml.setRequestHeader('Accept', 'multipart/form-data');
 //xml.setRequestHeader('Content-Type', 'application\/x-www-form-urlencoded');
 xml.onloadend = response;
 xml.send(send);

How can I set the setRequestHeader to allow all file types or at least the ones I need which is text and file type, is there a specific setRequestHeader for that?