Google analytics server side.md

By using the measurement protocol events can be sent to GA with any HTTP client (brower or server side).

curl 'https://www.google-analytics.com/collect' \
  -H 'user-agent: switch-server' \
  --data-raw 'v=1&t=event&tid=UA-XXXXXXXX-Y&cid=cid3&ec=upgrade&ea=start_trial&el=Start%20trial&ev=1' \
  --compressed

Note: user-agent is required. OR

fetch("https://www.google-analytics.com/collect", {
  "headers": {
    "content-type": "application/x-www-form-urlencoded; charset=UTF-8",
  },
  "body": "v=1&t=event&tid=UA-XXXXXXXX-Y&cid=cid3&ec=upgrade&ea=start_trial&el=Start%20trial&ev=1",
  "method": "POST",
  "mode": "cors",
  "credentials": "omit"
});

Replace upgrade with your own event category and start_trial with your own event action and Start trial with your own event label.

Use https://ga-dev-tools.appspot.com/hit-builder/ to generate the event. The fields available are documented at https://developers.google.com/analytics/devguides/collection/protocol/v1/devguide The reference at https://developers.google.com/analytics/devguides/collection/protocol/v1/reference mentions that user agent is required.

I got to these via https://stackoverflow.com/a/9509684/400048 and https://stackoverflow.com/a/32313490/400048