RApache passes NULL for empty GET parameters about rapache HOT 3 OPEN

library(Rook)

app <- function(env) {
  req <- Request$new(env)
  res <- Response$new()
  vars <- capture.output(print(req$GET()))
  res$write(c("<pre>", paste(vars, collapse = "\n"), "</pre>"))
  res$finish()
}

s <- Rhttpd$new()
s$start(port = 12345)
s$add(app, 'foo')