Configure SSL on Windows HTTP server using HTTPAPI_VERSION_1 APIs

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I configured SSL on my Windows HTTP server (HTTP listener) developed using HTTPAPI_VERSION_1 API's using HttpSetServiceConfiguration. I used a self signed certificate and followed the steps at this link to set it as trusted http://blogs.msdn.com/b/jpsanders/archive/2009/09/29/walkthrough-using-httplistener-as-an-ssl-simple-server.aspx[^]

Then I tried using the sample in MSDN named WinHttpPostSample to connect to the HTTP server using HTTPS. But WinHttpSendRequest API always fails with error 12044 (ERROR_INTERNET_CLIENT_AUTH_CERT_NEEDED).

How can we prevent the HTTP server from sending this error or to make it not compulsory for the server to have a client certificate to proceed.