The subscriber sends a SUBSCRIBE_NAMESPACE control message on a new bidirectional stream to a publisher to request the current set of matching published namespaces, as well as future updates to the set.
SUBSCRIBE_NAMESPACE Message {
Type (vi64) = 0x50,
Length (16),
Request ID (vi64),
Track Namespace Prefix (..),
Number of Parameters (vi64),
Parameters (..) ...
}
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Request ID: See Section 6.4.2.1.
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Track Namespace Prefix: A Track Namespace structure as described in Section 8.7, matched as a prefix (see Section 2.4.2).
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Parameters: The parameters are defined in Section 9.20. The only parameter that can appear in a SUBSCRIBE_NAMESPACE is AUTHORIZATION_TOKEN.