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
How to recover
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.