CLIENT CAPA

Clients can declare their capabilities to Valkey using the CLIENT CAPA command, and Valkey will adjust the corresponding features for the current connection based on the declared client capabilities.

Multiple capabilities can be declared in the command. If any capabilities are unrecognized, Valkey will ignore them instead of returning an error.

The capabilities currently supported are:

• redirect - This indicates that the client is capable of handling redirect messages. When accessing a replica node in standalone mode, if a data operation is performed (read or write commands), Valkey will return -REDIRECT primary-ip:port to this connection. Note that the primary-ip can be an IPv6 which itself contains colons, so to properly parse ip and port, a client needs to locate the last colon. Using the READONLY command can enable this connection to execute read commands on the replica node.

RESP2/RESP3 Reply

Simple string reply: OK.