POST http://localhost:8080/ Content-Length: 509 Content-Type: text/xml SOAPAction: "Text/Caps#capitalize" <?xml version="1.0" encoding="UTF-8"?> <SOAP-ENV:Envelope ...

Do you have access to an ASP.NET server? Cos creating an ASMX soap class will give you a grounding on messaging via SOAP, and you can turn on GET;POST if you want to message via plain-old-XML (POX).