main.swift

import Vapor

let root = Droplet()
root.get { req in return try root.view.make("welcome", []) }

root.group("v1") { v1 in 
  v1.group("prefs") { prefs in
    let controller = PrefsController()

    prefs.get("index", controller.index)
    prefs.get("update", controller.update)
  }
}

root.run()

import Vapor
import HTTP

final class PrefsController {
func index(_ request: Request) throws -> ResponseRepresentable {
return "Hello index"
}

func update(_ request: Request) throws -> ResponseRepresentable {
    return "Hello update"
}

}