XML header for WebServices (SOAP)

Question

Hi all!
I have quite strange problem about XML header in SOAP message for WS. Usually I don't care about XML header in SOAP message, because so far I had no problems calling load of WS on different servers. Stnadard XML header that comes out looks like this (1.0 and UTF-8 are in single quotes): <?xml version='1.0' encoding='UTF-8'?>.
But this time, the webserver I'm trying to call accepts only double quotes, e.g. like this: <?xml version="1.0' encoding="UTF-8"?>, it doesn't understand single quotes at all and there is no way of changing it!
JDeveloper uses apache soap for standard and makes single quotes. I tried raw http call by wrapping all text into post method -> that works, so webservice is working.
I can't set anything except endpoint, parameters, method :(
How can I make call that uses double quotes?
Pseudo logic is like this:
Vector params = new Vector();
params.addElement(xxxx);
Call call=new Call("xxx", "xxx", params, xxx, Constants.NS_URI_SOAP_ENC);
Response response = call.invoke(endpointURL, "xxx");

Answer 1

Hacked Oracle (apache) classes and put right values in it.
It was hard coded string, who on earth could thought that :D