Using CXF with Https Proxy

hi all,

i'm just stuck with a problem using cxf :

i implemented a soap client to a webservice using cxf 2.6.1 and its working fine... now i have the challenge of sending one single service operation
to the usual endpoint but over a proxy server that only accepts https.

so these are the base facts :

Service Endpoint : https://some-usual-soap-endpoint.com

Proxy Server : https://some-weird-https-proxy.com
Proxy Port : 7777

This is my approach :

HTTPClientPolicy policy = new HTTPClientPolicy();
policy.setProxyServer("some-weird-https-proxy.com");
policy.setProxyServerPort(7777);

Client client = ClientProxy.getClient(awspt);
HTTPConduit http = (HTTPConduit) client.getConduit();
http.setClient(policy);

so far so good, but the requests are reaching the proxy not using https, but http and the proxy is not accepting this.

can you help me, how to configure the Proxy Server within my Client, so Request is sent using https?

any help is highly appreciated!

kind regards