how to split each kind of request's method to another port?

I use apache in my web server, and now I use ProxyPass in order to get url from outside and send it to amother place in my server.. i.e: ProxyPass /send/message $http://localhost:1234/sender

but I want to manage it by methodes, not by url. I want to sent GET requests to one port (1234) but other request's method to another port.

how can I do that?