calling external web application by passing parameters and getting response back in webdynpro portal environment

Hello Experts,

I have a business problem wherein I need to call exernal Java web application by passing paramters like name, city, state, country and many more approx 15 fields in total from a webdynpro application which is in portal environment. After calling the web application it will send response back again to the same webdynpro application from where the call was originated. This all has to be done in portal environment. We ave to utilize HTTP POST request.

Can you help me in designing of this solution.

Thanks.