Safari authentication problem


We have a webtool, that requires an authentication.
To authenticate a user, we use the xmlhttprequest object in javascript, this object has a function 'open', where you can define the username and password for the request.
This works fine in most of the browsers, but not in safari.
We found out, that safari does not send the credentials, with the request. It doesn't send the authorization header.
Even if we use the basic html authentication, we are not able to autorize the client correctly. Safari sends the autorization header only one time, in the next request, the authorization header is gone again.

Do you have some good information about safari's authorization issues? Or better, does someone have an idea for a workaround?
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