Add Dynamic Parameters to Proxy Route

[UbuntuPenguin]

TL;DR  I need to make the route of the proxy change based on input
i.e localhost:3000/store/findstore/29301 where 29301 is the parameter from an input field.

Hello Everyone,
I am using RoR and I need to change the url based on my user input. I am extremely uncertain about which paths to go down, because looking at the Operation, Proxy and Ext.Router(?) classes, it seems as if both might be a solution. I was just wondering if anyone had any experience solving this problem or any suggestions.

[UbuntuPenguin]

One example I saw on stackoverflow involved man-handling the url of the proxy, so I will probably do that until told otherwise.