Kafka ApiVersions Response Wire Format v0 — Binary Protocol Layout

What is ApiVersions?

Sent by every client on every new connection to discover what API versions the broker supports. UNSUPPORTED_VERSION errors in client logs appear when a client is newer than the broker; this API prevents that by letting the client downgrade gracefully.

Schema
{
  "ErrorCode": int16,
  "ApiKeys": [{
      "ApiKey": int16,
      "MinVersion": int16,
      "MaxVersion": int16
  }]
}

Example
{
  "ErrorCode": 0,
  "ApiKeys": [{
      "ApiKey": 0,
      "MinVersion": 1,
      "MaxVersion": 1
  }]
}