SOAP/HTTP to Proxy: How to Forward whole SOAP Envelope as Payload to ABAP-Proxy

Hello PI-Experts,

I am getting a SOAP-Request in my PI System. But I dont have a webservice to consume it.

My Partner System is sending me the SOAP call using a somple plain-http-Request to my PI. I am getting the whole SOAP request as HTTP-payload. 

Is there a simple way to forward the whole payload as a string to ABAP-Proxy? An ABAP program should scan the payload and use the Content.

Thanks

Armin