However for IE6 it is more difficult. The best solution I have found is this one:
- Download Fiddler.
- Open the 'Customize Rules' window (Rules->Customize Rules...)
- find this function: static function OnBeforeRequest(oSession: Session)
- inside this function, add the header values that you would like to add, in this format:
oSession.oRequest["headerName"] = "headerValue";
Voilà! Internet Explorer will now accept your custom header values. You will probably need to clear your browser cookies before it takes effect.