kapow route add /log_and_stuff - <<- 'EOF'
  callback_url=$(kapow get /request/params/callback)
  echo this is a quite long sentence and other stuff | tee log.txt | kapow set /response/body
  echo sending to $callback_url | kapow set /response/body
  curl -X POST --data-binary @log.txt $callback_url | kapow set /response/body
EOF