UTL_HTTP and client certificate request

I am hoping that someone can help me. We have a web site that we need to hit and pull the html code back from the pages and we have the code to get what we need but the website now has an option where it requests a client certificate from a user for authentication or if you cancel the request it will then ask you for username and password. I cannot figure out how to submit a cancel on the client certificate request so that my application can submit the username and password authentication. Does anyone have an idea or example to do this? Also if you submit a bad certificate it will prompt you for authentication. So if someone knows how to submit client certificates that would be helpful as well.
Thanks in advance.

I've never faced this issue but you might want to look at using UTL_TCP rather than UTL_HTTP.
http://www.psoug.org/reference/utl_tcp.html

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