missing_required_header - Unkey Docs

err:user:bad_request:missing_required_header

This code is reserved, and the API doesn’t return it.

How to fix

There’s nothing to fix. Send Authorization: Bearer <root key> and Content-Type: application/json on every request. If one is missing, you get one of the errors below.

err:unkey:authentication:missing: the endpoint doesn’t accept the kind of credential you sent.
err:unkey:application:invalid_input: the request failed validation, including a missing Authorization header or a wrong or missing Content-Type.

Last modified on October 6, 2026

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