invalid_beacon

Invalid beacon. Answered with 400.

What it means

The page-view beacon's body is not the shape the counter takes. A Page View is a number and nothing else, so there is little in the body to get wrong.

What to do

Fix the body before retrying. A page view is not worth a retry loop; drop it instead.

The body

{
  "type": "https://tigby.eu/problems/invalid_beacon",
  "title": "Invalid beacon",
  "status": 400,
  "detail": "…what was refused, naming this request's own values",
  "code": "invalid_beacon",
  "doc_url": "https://docs.tigby.eu/errors/invalid_beacon",
  "agent_hint": "…the next step, for software"
}

Branch on code. The detail names this request's own Handle, id or limit and is not part of the contract.