.nim

var data: array[5, seq[string]]
  
proc refreshMensaData() {.async.} =
  while true:
    data.fill(@[])
    var client = newAsyncHttpClient()
    var thisweek = await client.getContent("target.url.example.com")
    #[ here happens some stuff ]#
    data[0].add(thisWeek.parseHtml()) # Guessing here
    # timeout in seconds, i'm guessing you want to run this multiple times
    await sleepAsync(10000) 

when isMainModule:
  asyncCheck refreshMensaData()

  # serve the data
  var server = newAsyncHttpServer()
  proc cb(req: Request) {.async.} =
    await req.respond(Http200, #[either html or json ]# ))
  waitFor server.serve(Port(80), cb)