synchronous HTTP Response

Hello,

In our process we receive a cXML document via http which creates a SO in our R/3 system. According to the cXML specification we need to send a response xml back to the trade partner. This response needs to specify if the xml was well received or not and must be sent back in the http response of the original http request.

How can we put this into XI? When I compare to the RNIF/CIDX adapter, there this response is sent out via the adapter. Can we enhance the http adapter in some way for this behaviour.

Other possibility is to use BPM, but this looks heavy for this simple process.

Greetings,

Bart