URL Shortener in Nim

tdrly.nim

import jester, tables, md5

var urls {.threadvar.}: Table[string, string]

routes:
  get "/":
    if @"url" != "":
      let id = ($(@"url".toMD5)).substr(0, 5)
      urls[id] = @"url"
      resp id
    else:
      resp Http204, ""

  get "/@id":
    if urls.hasKey(@"id") == true:
      resp Http301, [(key: "location", value: urls[@"id"])], ""
    else:
      resp Http404, "No key"