将自定义Http标头添加到Web服务代理

I have an old application that uses the classic Web Service Proxy to interact with a Java Web Service. A while back the Web Service hoster decided to require a custom HTTP header to be sent with each request in order to access the service - otherwise the requests are thrown out outright (looks like this is some sort of router requirement). Regardless of what the reason I need to inject a custom HTTP header into the request. I have an old application that uses the classic