Summary
The JavaScript tracker release 2.10.0 defaults to Beacon API for sending events.
Beacon API as implemented in Chrome has a bug where requests made with Content-type: application/json requests raise an exception, and therefore do not send.
Who is affected
You are affected by this issue if you’re using the JavaScript tracker version 2.10.0 and have not set any argmap keys related to event sending methods like post or eventMethod.
How to recover
Set eventMethod to post in the argmap in version 2.10.0, or upgrade to 2.10.1.
How to avoid this issue
We have addressed this bug in 2.10.1 and, as a result, encourage people to upgrade to this version.