plumber R

# plumber.R
gif <- jsonlite::base64_dec("R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==")

#* @get /pixel.gif
#* @serializer contentType list(type = "image/gif")
function(res) {
  res$setHeader("Cache-Control", "no-store")
  gif
}