Adding Query String Parameters with ISAPI Filter 1

[sdc]

Hello,
I am writing an ISAPI filter and I want it to add additional query string parameters to the URL. Does anyone know of a way to do this? I can do it by building a new URL and then redirecting to that URL, but this introduces another problem which is having to pass along any POST data that was submitted which brings me to another question. Is it possible to obtain the POST data without implementing OnReadRawData?

Thanks or your help,
Scott