Im the author of the JSON script. I meant for most of the XHR objects to be SERVERXMLHTTP, sorry about that.
I have updated it, fixing a few issues that have been spotted.
With the
updated version, this should work, without the result being cached:
alias checkit {
JSONOpen -duw height http://127.0.0.1:8085/telemachus/datalink?a=v.altitude
JSONURLOption height Cache-Control no-cache
JSONGet height
echo -a $json(height,a)
}