Add Duplicate HTTP Response Headers in Nodejs

I am looking for adding duplicate HTTP headers in the http response in Nodejs, something like:

HTTP/1.1 206 Partial Content
Content-Length: 1234567
Content-Type: video/ogg
Content-type: multipart/byteranges; boundary=THIS_STRING_SEPARATES

I am using the http module provided by Nodejs and when I send the response header, I can only define one "Content-Type" header:

var header = {};
header['Content-Type'] = "video/ogg";

or

header['Content-Type'] = "multipart/byteranges; boundary=THIS_STRING_SEPARATES";

Is it possible to include both "Content-Type" in the response? Thanks.