[Haskell-beginners] web client/server app - what to choose

Hi, please can you help me with following: I would like to make a server/client web app, but I'm not sure what packages/modules would do the best. I did several client/server applications not in Haskell, where I have used REST (JSON) API as a communication between client and server. In Haskell I'm not sure what would be best, but for future use most probably also REST/JSON would be best. Server will do some realtime mathematical calculations . After its done it will send to client results. Client will visualize the results via WebGL/Threejs. I was thinking about Snap for server but for client I'm not really not sure. Any ideas/comments more than appreciated ;-) Cheers, M.