typedef TBeforePostEvent TBeforePostEvent;
TBeforePostEvent is the type of the OnBeforePost event of THTTPReqResp.
TBeforePostEvent is the type of the OnBeforePost event handler, which is called before an HTTP request message containing SOAP content is sent to a Web Service provider.
HTTPReqResp is the component that generates and sends the HTTP request message.
Data is a handle to the wininet request object.