Kafka SaslHandshake Response Wire Format v1 — Binary Protocol Layout

What is SaslHandshake?

Negotiates the SASL authentication mechanism immediately after TCP connection, before any data flows. If the client requests a mechanism the broker doesn't support (e.g., SCRAM-SHA-512 when only PLAIN is configured), the broker responds with the supported list and closes the connection.

Schema
{
  "ErrorCode": int16,
  "Mechanisms": [string]
}

Example
{
  "ErrorCode": 0,
  "Mechanisms": ["PLAIN", "SCRAM-SHA-256"]
}