How to give Username and password when calling HTTP page?

I have this code when i run this I get credentials error. How to give credentials .The authentication is set to windows in the https page. Means pop up will appear to get the credentials
declare
req UTL_HTTP.REQ;
resp UTL_HTTP.RESP;
value varchar2(1024);
p_url varchar2(4000);
OPT varchar2(1000);
BEGIN
dbms_output.put_line('');
p_url:='http://www.xyz.com/';
dbms_output.put_line(p_url);
req := UTL_HTTP.begin_REQUEST(p_url);
utl_http.set_header(req, 'User-Agent', 'Mozilla/4.0');
resp := utl_http.get_response(req);
loop
utl_http.read_line(resp, value, true);
dbms_output.put_line(value);
end loop;
exception
when utl_http.end_of_body then
utl_http.end_response(resp);
END;
When i run this i get
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>
<title>401 - Unauthorized: Access is denied due to invalid credentials.</title>
<style type="text/css">

Basic authentication is set using the UTL_HTTP.Set_Authentication() call.
If you are using a proxy and need procy authentication, you can set the username and password for proxy access, as part of the proxy URL. E.g.
utl_http.set_proxy( 'http://proxyuser:[email protected]', null );NTLM (Windows NT LAN Manager) authentication is proprietary and not part of the HTTP specifications. If that is needed, try and use the username and password as part of the URL - or do some research on how to manually perform NTLM authentication.
If you are using HTTPS, you need an Oracle Wallet with that server's certificate (making it a trusted certificate), and then set/use the wallet using the UTL_HTTP.Set_Wallet() call. See sample code in {message:id=10820182}.

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