# unsupported_api_version

Unsupported API version: HTTP 400.

HTTP 400 · Unsupported API version

## Meaning
The Api-Version header names a date that isn't one of the versions served.

## Fix
Send one of the versions the reference lists, or omit the header to use the current version.

## Retry
The same call fails again until something changes.

## Returned by
- [`GET /health`](/reference/status#get-health)
- [`GET /v1/status`](/reference/status#get-status)
- [`GET /v1/reference`](/reference/reference#list-reference)
- [`GET /v1/reference/{topic_id}`](/reference/reference#get-reference)
- [`POST /v1/wire/tickets`](/reference/wire#get-wire-ticket)
- [`GET /v1/stream/{topic}`](/reference/wire#stream-topic)
- [`POST /v1/answers`](/reference/answers#create-answer)

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Generated from registry/generated/problems.json

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