401 Authentication required

What causes it

• The `X-API-Key` header was missing.
• An `Authorization` header was sent but not in `Bearer <key>` form.
• A proxy or client library stripped the header.

How to fix it

1. Send `X-API-Key: <your key>`, or `Authorization: Bearer <your key>`.
2. If you do not have a key yet, request one. It is issued by hand, usually within a day.
3. `/v1/health` needs no key; call it first to confirm the service is reachable.

What it looks like

{
  "type": "https://snakereach.com/errors/authentication-required",
  "title": "Authentication required",
  "status": 401,
  "detail": "Provide your key in the X-API-Key header, or as Authorization: Bearer <key>."
}

See also

Authentication · Request a key · All errors