soap with proxy

Hi!
 
I'm a newbie in using Apache SOAP, and I have the following scenario:
 
I have a SOAP client and a server, and I need the client to connect to the server through a proxy. Without proxy, it works fine. I set the proxy parameters (hostname and port) but I get the following error: 
Unsupported response content type "text/html", must be: "text/xml". 
The proxy is running Apache, not Tomcat. 
 
Any help would be greatly appreciated.
 

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