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Client flow:

1. If sasl.mechanisms is specified as a non-empty list contains any mechanism other than GSSAPI, send a packet with empty payload (just the 4-byte size field set to zero) to the server. Otherwise go to Step 4 with GSSAPI as the selected mechanism.
   • Packet Format: |Empty|
2. Wait for list of SASL mechanisms from the server
3. Select a mechanism from the mechanisms enabled in the server and send the selected mechanism to the server
   • Packet Format: | Version (Int16) | Mechanism (String) |
4. Create SaslClient with the selected mechanism
5. Perform SASL authentication with the selected mechanism

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