gistfile1.rb

before do
  content_type :jsonp
  @backend = Visage::Config.backend
end

# /data/:host/:plugin/:optional_plugin_instance
get %r{/data/([^/]+)/([^/]+)((/[^/]+)*)} do
  # parameter unpacking

  options = {
    :host        => host,
    :plugin      => plugin,
    :instances   => instances,
    :start       => start,
    :finish      => finish,
    :percentiles => percentiles,
    :resolution  => resolution
  }
  json = @backend.json(options)

  maybe_wrap_with_callback(json)
end