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2841 lines
78 KiB
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<title>Developing a Client ยท NATS</title>
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<li class="chapter " data-level="1.1" data-path="../">
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<a href="../">
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Introduction
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</a>
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<li class="chapter " data-level="1.2" data-path="../whats_new/whats_new_20.html">
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<a href="../whats_new/whats_new_20.html">
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What's New in 2.0
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</a>
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</li>
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<li class="header">Concepts</li>
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<li class="chapter " data-level="2.1" data-path="../developer/concepts/intro.html">
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<a href="../developer/concepts/intro.html">
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What is NATS
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</a>
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<li class="chapter " data-level="2.2" data-path="../developer/concepts/subjects.html">
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<a href="../developer/concepts/subjects.html">
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Subject-Based Messaging
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</a>
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<a href="../developer/concepts/pubsub.html">
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Publish-Subscribe
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</a>
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<li class="chapter " data-level="2.4" data-path="../developer/concepts/reqreply.html">
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<a href="../developer/concepts/reqreply.html">
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Request-Reply
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</a>
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</li>
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<li class="chapter " data-level="2.5" data-path="../developer/concepts/queue.html">
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<a href="../developer/concepts/queue.html">
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Queue Groups
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</a>
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</li>
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<li class="chapter " data-level="2.6" data-path="../developer/concepts/acks.html">
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<a href="../developer/concepts/acks.html">
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Acknowledgements
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</a>
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</li>
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<li class="chapter " data-level="2.7" data-path="../developer/concepts/seq_num.html">
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<a href="../developer/concepts/seq_num.html">
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Sequence Numbers
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</a>
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</li>
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<li class="header">Developing With NATS</li>
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<li class="chapter " data-level="3.1" data-path="../developer/">
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<a href="../developer/">
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Introduction
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</a>
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</li>
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<li class="chapter " data-level="3.2" data-path="../developer/connecting/intro.html">
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<a href="../developer/connecting/intro.html">
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Connecting
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.2.1" data-path="../developer/connecting/default_server.html">
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<a href="../developer/connecting/default_server.html">
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Connecting to the Default Server
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</a>
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</li>
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<li class="chapter " data-level="3.2.2" data-path="../developer/connecting/specific_server.html">
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<a href="../developer/connecting/specific_server.html">
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Connecting to a Specific Server
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</a>
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</li>
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<li class="chapter " data-level="3.2.3" data-path="../developer/connecting/cluster.html">
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<a href="../developer/connecting/cluster.html">
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Connecting to a Cluster
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</a>
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</li>
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<li class="chapter " data-level="3.2.4" data-path="../developer/connecting/connect_timeout.html">
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<a href="../developer/connecting/connect_timeout.html">
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Setting a Connect Timeout
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</a>
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</li>
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<li class="chapter " data-level="3.2.5" data-path="../developer/connecting/pingpong.html">
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<a href="../developer/connecting/pingpong.html">
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Ping/Pong Protocol
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</a>
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</li>
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<li class="chapter " data-level="3.2.6" data-path="../developer/connecting/protocol.html">
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<a href="../developer/connecting/protocol.html">
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Controlling the Client/Server Protocol
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</a>
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</li>
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<li class="chapter " data-level="3.2.7" data-path="../developer/connecting/noecho.html">
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<a href="../developer/connecting/noecho.html">
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Turning Off Echo'd Messages
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.3" data-path="../developer/reconnect/intro.html">
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<a href="../developer/reconnect/intro.html">
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Automatic Reconnections
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.3.1" data-path="../developer/reconnect/disable.html">
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<a href="../developer/reconnect/disable.html">
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Disabling Reconnect
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</a>
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</li>
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<li class="chapter " data-level="3.3.2" data-path="../developer/reconnect/max.html">
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<a href="../developer/reconnect/max.html">
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Set the Number of Reconnect Attempts
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</a>
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</li>
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<li class="chapter " data-level="3.3.3" data-path="../developer/reconnect/wait.html">
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<a href="../developer/reconnect/wait.html">
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Pausing Between Reconnect Attempts
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</a>
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</li>
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<li class="chapter " data-level="3.3.4" data-path="../developer/reconnect/random.html">
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<a href="../developer/reconnect/random.html">
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Avoiding the Thundering Herd
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</a>
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</li>
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<li class="chapter " data-level="3.3.5" data-path="../developer/reconnect/events.html">
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<a href="../developer/reconnect/events.html">
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Listening for Reconnect Events
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</a>
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</li>
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<li class="chapter " data-level="3.3.6" data-path="../developer/reconnect/buffer.html">
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<a href="../developer/reconnect/buffer.html">
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Buffering Messages During Reconnect Attempts
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.4" data-path="../developer/security/intro.html">
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<a href="../developer/security/intro.html">
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Securing Connections
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.4.1" data-path="../developer/security/userpass.html">
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<a href="../developer/security/userpass.html">
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Authenticating with a User and Password
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</a>
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</li>
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<li class="chapter " data-level="3.4.2" data-path="../developer/security/token.html">
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<a href="../developer/security/token.html">
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Authenticating with a Token
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</a>
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</li>
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<li class="chapter " data-level="3.4.3" data-path="../developer/security/nkey.html">
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<a href="../developer/security/nkey.html">
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Authenticating with an NKey
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</a>
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</li>
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<li class="chapter " data-level="3.4.4" data-path="../developer/security/creds.html">
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<a href="../developer/security/creds.html">
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Authenticating with a Credentials File
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</a>
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</li>
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<li class="chapter " data-level="3.4.5" data-path="../developer/security/tls.html">
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<a href="../developer/security/tls.html">
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Encrypting Connections with TLS
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.5" data-path="../developer/receiving/intro.html">
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<a href="../developer/receiving/intro.html">
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Receiving Messages
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.5.1" data-path="../developer/receiving/sync.html">
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<a href="../developer/receiving/sync.html">
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Synchronous Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.2" data-path="../developer/receiving/async.html">
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<a href="../developer/receiving/async.html">
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Asynchronous Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.3" data-path="../developer/receiving/unsubscribing.html">
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<a href="../developer/receiving/unsubscribing.html">
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Unsubscribing
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</a>
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</li>
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<li class="chapter " data-level="3.5.4" data-path="../developer/receiving/unsub_after.html">
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<a href="../developer/receiving/unsub_after.html">
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Unsubscribing After N Messages
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</a>
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</li>
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<li class="chapter " data-level="3.5.5" data-path="../developer/receiving/reply.html">
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<a href="../developer/receiving/reply.html">
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Replying to a Message
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</a>
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</li>
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<li class="chapter " data-level="3.5.6" data-path="../developer/receiving/wildcards.html">
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<a href="../developer/receiving/wildcards.html">
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Wildcard Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.7" data-path="../developer/receiving/queues.html">
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<a href="../developer/receiving/queues.html">
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Queue Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.8" data-path="../developer/receiving/drain.html">
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<a href="../developer/receiving/drain.html">
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Draining Messages Before Disconnect
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</a>
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</li>
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<li class="chapter " data-level="3.5.9" data-path="../developer/receiving/structure.html">
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<a href="../developer/receiving/structure.html">
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Structured Data
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.6" data-path="../developer/sending/intro.html">
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<a href="../developer/sending/intro.html">
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Sending Messages
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.6.1" data-path="../developer/sending/replyto.html">
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<a href="../developer/sending/replyto.html">
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Including a Reply Subject
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</a>
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</li>
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<li class="chapter " data-level="3.6.2" data-path="../developer/sending/request_reply.html">
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<a href="../developer/sending/request_reply.html">
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Request-Reply Semantics
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</a>
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</li>
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<li class="chapter " data-level="3.6.3" data-path="../developer/sending/caches.html">
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<a href="../developer/sending/caches.html">
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Caches, Flush and Ping
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</a>
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</li>
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<li class="chapter " data-level="3.6.4" data-path="../developer/sending/structure.html">
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<a href="../developer/sending/structure.html">
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Sending Structured Data
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.7" data-path="../developer/events/intro.html">
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<a href="../developer/events/intro.html">
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Monitoring the Connection
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.7.1" data-path="../developer/events/events.html">
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<a href="../developer/events/events.html">
|
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Listen for Connection Events
|
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</a>
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</li>
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<li class="chapter " data-level="3.7.2" data-path="../developer/events/slow.html">
|
|
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|
<a href="../developer/events/slow.html">
|
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Slow Consumers
|
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.8" data-path="../developer/tutorials/intro.html">
|
|
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|
<a href="../developer/tutorials/intro.html">
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Tutorials
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</a>
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<ul class="articles">
|
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<li class="chapter " data-level="3.8.1" data-path="../developer/tutorials/pubsub.html">
|
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<a href="../developer/tutorials/pubsub.html">
|
|
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|
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Explore NATS Pub/Sub
|
|
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</a>
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</li>
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|
<li class="chapter " data-level="3.8.2" data-path="../developer/tutorials/reqreply.html">
|
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<a href="../developer/tutorials/reqreply.html">
|
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|
|
Explore NATS Request/Reply
|
|
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</a>
|
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</li>
|
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|
|
<li class="chapter " data-level="3.8.3" data-path="../developer/tutorials/queues.html">
|
|
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|
<a href="../developer/tutorials/queues.html">
|
|
|
|
|
|
Explore NATS Queueing
|
|
|
|
</a>
|
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</li>
|
|
|
|
<li class="chapter " data-level="3.8.4" data-path="../developer/tutorials/custom_dialer.html">
|
|
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|
<a href="../developer/tutorials/custom_dialer.html">
|
|
|
|
|
|
Advanced Connect and Custom Dialer in Go
|
|
|
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</a>
|
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</li>
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</ul>
|
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</li>
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|
|
<li class="header">NATS Server</li>
|
|
|
|
|
|
|
|
<li class="chapter " data-level="4.1" data-path="../nats_server/installation.html">
|
|
|
|
<a href="../nats_server/installation.html">
|
|
|
|
|
|
Installing
|
|
|
|
</a>
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="4.2" data-path="../nats_server/running.html">
|
|
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|
<a href="../nats_server/running.html">
|
|
|
|
|
|
Running
|
|
|
|
</a>
|
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|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.2.1" data-path="../nats_server/windows_srv.html">
|
|
|
|
<a href="../nats_server/windows_srv.html">
|
|
|
|
|
|
Window Service
|
|
|
|
</a>
|
|
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|
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</li>
|
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|
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</ul>
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="4.3" data-path="../nats_server/clients.html">
|
|
|
|
<a href="../nats_server/clients.html">
|
|
|
|
|
|
Clients
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.4" data-path="../nats_server/flags.html">
|
|
|
|
<a href="../nats_server/flags.html">
|
|
|
|
|
|
Flags
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5" data-path="../nats_server/configuration.html">
|
|
|
|
<a href="../nats_server/configuration.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.1" data-path="../nats_server/securing_nats.html">
|
|
|
|
<a href="../nats_server/securing_nats.html">
|
|
|
|
|
|
Securing NATS
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.1.1" data-path="../nats_server/tls.html">
|
|
|
|
<a href="../nats_server/tls.html">
|
|
|
|
|
|
Enabling TLS
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2" data-path="../nats_server/auth_intro.html">
|
|
|
|
<a href="../nats_server/auth_intro.html">
|
|
|
|
|
|
Authentication
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.1.2.1" data-path="../nats_server/tokens.html">
|
|
|
|
<a href="../nats_server/tokens.html">
|
|
|
|
|
|
Tokens
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.2" data-path="../nats_server/username_password.html">
|
|
|
|
<a href="../nats_server/username_password.html">
|
|
|
|
|
|
Username/Password
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.3" data-path="../nats_server/tls_mutual_auth.html">
|
|
|
|
<a href="../nats_server/tls_mutual_auth.html">
|
|
|
|
|
|
TLS Authentication
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.4" data-path="../nats_server/nkey_auth.html">
|
|
|
|
<a href="../nats_server/nkey_auth.html">
|
|
|
|
|
|
NKeys
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.5" data-path="../nats_server/accounts.html">
|
|
|
|
<a href="../nats_server/accounts.html">
|
|
|
|
|
|
Accounts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.6" data-path="../nats_server/jwt_auth.html">
|
|
|
|
<a href="../nats_server/jwt_auth.html">
|
|
|
|
|
|
JWTs
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.7" data-path="../nats_server/auth_timeout.html">
|
|
|
|
<a href="../nats_server/auth_timeout.html">
|
|
|
|
|
|
Authentication Timeout
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.3" data-path="../nats_server/authorization.html">
|
|
|
|
<a href="../nats_server/authorization.html">
|
|
|
|
|
|
Authorization
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.2" data-path="../nats_server/clustering.html">
|
|
|
|
<a href="../nats_server/clustering.html">
|
|
|
|
|
|
Clustering
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.2.1" data-path="../nats_server/cluster_config.html">
|
|
|
|
<a href="../nats_server/cluster_config.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.2.2" data-path="../nats_server/cluster_tls.html">
|
|
|
|
<a href="../nats_server/cluster_tls.html">
|
|
|
|
|
|
TLS Authentication
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.3" data-path="../gateways/">
|
|
|
|
<a href="../gateways/">
|
|
|
|
|
|
Gateways
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.3.1" data-path="../gateways/gateway.html">
|
|
|
|
<a href="../gateways/gateway.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.4" data-path="../leafnodes/">
|
|
|
|
<a href="../leafnodes/">
|
|
|
|
|
|
Leaf Nodes
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.4.1" data-path="../leafnodes/leafnode_conf.html">
|
|
|
|
<a href="../leafnodes/leafnode_conf.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.5" data-path="../nats_server/logging.html">
|
|
|
|
<a href="../nats_server/logging.html">
|
|
|
|
|
|
Logging
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.6" data-path="../nats_server/monitoring.html">
|
|
|
|
<a href="../nats_server/monitoring.html">
|
|
|
|
|
|
Monitoring
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6" data-path="../nats_admin/">
|
|
|
|
<a href="../nats_admin/">
|
|
|
|
|
|
Managing A NATS Server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.6.1" data-path="../nats_admin/upgrading_cluster.html">
|
|
|
|
<a href="../nats_admin/upgrading_cluster.html">
|
|
|
|
|
|
Upgrading a Cluster
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.2" data-path="../nats_admin/slow_consumers.html">
|
|
|
|
<a href="../nats_admin/slow_consumers.html">
|
|
|
|
|
|
Slow Consumers
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.3" data-path="../nats_admin/signals.html">
|
|
|
|
<a href="../nats_admin/signals.html">
|
|
|
|
|
|
Signals
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.4" data-path="../sys_accounts/">
|
|
|
|
<a href="../sys_accounts/">
|
|
|
|
|
|
System Accounts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.6.4.1" data-path="../sys_accounts/sys_accounts.html">
|
|
|
|
<a href="../sys_accounts/sys_accounts.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.7" data-path="../nats_docker/">
|
|
|
|
<a href="../nats_docker/">
|
|
|
|
|
|
NATS and Docker
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.7.1" data-path="../nats_docker/tutorial.html">
|
|
|
|
<a href="../nats_docker/tutorial.html">
|
|
|
|
|
|
Tutorial
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.7.2" data-path="../nats_docker/docker_swarm.html">
|
|
|
|
<a href="../nats_docker/docker_swarm.html">
|
|
|
|
|
|
Docker Swarm
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
<li class="header">NATS Tools</li>
|
|
|
|
|
|
|
|
<li class="chapter " data-level="5.1" data-path="../nats_tools/mkpasswd.html">
|
|
|
|
<a href="../nats_tools/mkpasswd.html">
|
|
|
|
|
|
mkpasswd
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2" data-path="../nats_tools/nk.html">
|
|
|
|
<a href="../nats_tools/nk.html">
|
|
|
|
|
|
nk
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3" data-path="../nats_tools/nsc/">
|
|
|
|
<a href="../nats_tools/nsc/">
|
|
|
|
|
|
nsc
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.3.1" data-path="../nats_tools/nsc/nsc.html">
|
|
|
|
<a href="../nats_tools/nsc/nsc.html">
|
|
|
|
|
|
Basics
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.2" data-path="../nats_tools/nsc/streams.html">
|
|
|
|
<a href="../nats_tools/nsc/streams.html">
|
|
|
|
|
|
Streams
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.3" data-path="../nats_tools/nsc/services.html">
|
|
|
|
<a href="../nats_tools/nsc/services.html">
|
|
|
|
|
|
Services
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.4" data-path="../nats_tools/nsc/signing_keys.html">
|
|
|
|
<a href="../nats_tools/nsc/signing_keys.html">
|
|
|
|
|
|
Signing Keys
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4" data-path="../nats_tools/nas/">
|
|
|
|
<a href="../nats_tools/nas/">
|
|
|
|
|
|
nats-account-server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.4.1" data-path="../nats_tools/nas/nas_conf.html">
|
|
|
|
<a href="../nats_tools/nas/nas_conf.html">
|
|
|
|
|
|
Basics
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4.2" data-path="../nats_tools/nas/inspecting_jwts.html">
|
|
|
|
<a href="../nats_tools/nas/inspecting_jwts.html">
|
|
|
|
|
|
Inspecting JWTs
|
|
|
|
</a>
|
|
|
|
|
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</li>
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<li class="chapter " data-level="5.4.3" data-path="../nats_tools/nas/mem_resolver.html">
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<a href="../nats_tools/nas/mem_resolver.html">
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Memory Resolver
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="5.5" data-path="../nats_tools/nats_top/">
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<a href="../nats_tools/nats_top/">
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nats-top
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</a>
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<ul class="articles">
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<li class="chapter " data-level="5.5.1" data-path="../nats_tools/nats_top/tutorial.html">
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<a href="../nats_tools/nats_top/tutorial.html">
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Tutorial
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="5.6" data-path="../nats_tools/natsbench.html">
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<a href="../nats_tools/natsbench.html">
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nats-bench
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</a>
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</li>
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<li class="header">NATS Streaming Concepts</li>
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<li class="chapter " data-level="6.1" data-path="../nats_streaming/intro.html">
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<a href="../nats_streaming/intro.html">
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Introduction
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.1.1" data-path="../nats_streaming/relation-to-nats.html">
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<a href="../nats_streaming/relation-to-nats.html">
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Relation to NATS
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.2" data-path="../nats_streaming/client-connections.html">
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<a href="../nats_streaming/client-connections.html">
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Client Connections
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</a>
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</li>
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<li class="chapter " data-level="6.3" data-path="../nats_streaming/channels/channels.html">
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<a href="../nats_streaming/channels/channels.html">
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Channels
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.3.1" data-path="../nats_streaming/channels/message-log.html">
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<a href="../nats_streaming/channels/message-log.html">
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Message Log
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</a>
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</li>
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<li class="chapter " data-level="6.3.2" data-path="../nats_streaming/channels/subscriptions/subscriptions.html">
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<a href="../nats_streaming/channels/subscriptions/subscriptions.html">
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Subscriptions
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.3.2.1" data-path="../nats_streaming/channels/subscriptions/regular.html">
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<a href="../nats_streaming/channels/subscriptions/regular.html">
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Regular
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</a>
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</li>
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<li class="chapter " data-level="6.3.2.2" data-path="../nats_streaming/channels/subscriptions/durable.html">
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<a href="../nats_streaming/channels/subscriptions/durable.html">
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Durable
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</a>
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</li>
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<li class="chapter " data-level="6.3.2.3" data-path="../nats_streaming/channels/subscriptions/queue-group.html">
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<a href="../nats_streaming/channels/subscriptions/queue-group.html">
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Queue Group
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</a>
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</li>
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<li class="chapter " data-level="6.3.2.4" data-path="../nats_streaming/channels/subscriptions/redelivery.html">
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<a href="../nats_streaming/channels/subscriptions/redelivery.html">
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Redelivery
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</a>
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</li>
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</ul>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.4" data-path="../nats_streaming/store-interface.html">
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<a href="../nats_streaming/store-interface.html">
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Store Interface
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</a>
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</li>
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<li class="chapter " data-level="6.5" data-path="../nats_streaming/store-encryption.html">
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<a href="../nats_streaming/store-encryption.html">
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Store Encryption
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</a>
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</li>
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<li class="chapter " data-level="6.6" data-path="../nats_streaming/clustering/clustering.html">
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<a href="../nats_streaming/clustering/clustering.html">
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Clustering
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.6.1" data-path="../nats_streaming/clustering/supported-stores.html">
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<a href="../nats_streaming/clustering/supported-stores.html">
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Supported Stores
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</a>
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</li>
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<li class="chapter " data-level="6.6.2" data-path="../nats_streaming/clustering/configuration.html">
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<a href="../nats_streaming/clustering/configuration.html">
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Configuration
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</a>
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</li>
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<li class="chapter " data-level="6.6.3" data-path="../nats_streaming/clustering/auto-configuration.html">
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<a href="../nats_streaming/clustering/auto-configuration.html">
|
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Auto Configuration
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</a>
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</li>
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<li class="chapter " data-level="6.6.4" data-path="../nats_streaming/clustering/containers.html">
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<a href="../nats_streaming/clustering/containers.html">
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Containers
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.7" data-path="../nats_streaming/fault-tolerance/ft.html">
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<a href="../nats_streaming/fault-tolerance/ft.html">
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Fault Tolerance
|
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.7.1" data-path="../nats_streaming/fault-tolerance/active-server.html">
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<a href="../nats_streaming/fault-tolerance/active-server.html">
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Active Server
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</a>
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</li>
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<li class="chapter " data-level="6.7.2" data-path="../nats_streaming/fault-tolerance/standby-server.html">
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<a href="../nats_streaming/fault-tolerance/standby-server.html">
|
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Standby Servers
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</a>
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</li>
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<li class="chapter " data-level="6.7.3" data-path="../nats_streaming/fault-tolerance/shared-state.html">
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<a href="../nats_streaming/fault-tolerance/shared-state.html">
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Shared State
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</a>
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</li>
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<li class="chapter " data-level="6.7.4" data-path="../nats_streaming/fault-tolerance/failover.html">
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<a href="../nats_streaming/fault-tolerance/failover.html">
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Failover
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.8" data-path="../nats_streaming/partitioning.html">
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<a href="../nats_streaming/partitioning.html">
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Partitioning
|
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</a>
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</li>
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<li class="header">Developing With NATS Streaming</li>
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<li class="chapter " data-level="7.1" data-path="../developer/streaming/">
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<a href="../developer/streaming/">
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Introduction
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</a>
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</li>
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<li class="chapter " data-level="7.2" data-path="../developer/streaming/connecting.html">
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<a href="../developer/streaming/connecting.html">
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Connecting to NATS Streaming
|
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</a>
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</li>
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<li class="chapter " data-level="7.3" data-path="../developer/streaming/publishing.html">
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<a href="../developer/streaming/publishing.html">
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Publishing to a Channel
|
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</a>
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</li>
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<li class="chapter " data-level="7.4" data-path="../developer/streaming/receiving.html">
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<a href="../developer/streaming/receiving.html">
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Receiving Messages from a Channel
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</a>
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</li>
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<li class="chapter " data-level="7.5" data-path="../developer/streaming/durables.html">
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<a href="../developer/streaming/durables.html">
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Durable Subscriptions
|
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</a>
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</li>
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<li class="chapter " data-level="7.6" data-path="../developer/streaming/queues.html">
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<a href="../developer/streaming/queues.html">
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|
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Queue Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="7.7" data-path="../developer/streaming/acks.html">
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<a href="../developer/streaming/acks.html">
|
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Acknowledgements
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</a>
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</li>
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<li class="chapter " data-level="7.8" data-path="../developer/streaming/protocol.html">
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<a href="../developer/streaming/protocol.html">
|
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The Streaming Protocol
|
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</a>
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</li>
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<li class="header">NATS Streaming Server</li>
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<li class="chapter " data-level="8.1" data-path="../nats_streaming/gettingstarted/install.html">
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<a href="../nats_streaming/gettingstarted/install.html">
|
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Installing
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</a>
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</li>
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<li class="chapter " data-level="8.2" data-path="../nats_streaming/gettingstarted/run.html">
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<a href="../nats_streaming/gettingstarted/run.html">
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Running
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</a>
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</li>
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<li class="chapter " data-level="8.3" data-path="../nats_streaming/gettingstarted/configuring.html">
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<a href="../nats_streaming/gettingstarted/configuring.html">
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Configuring
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</a>
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</li>
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<li class="chapter " data-level="8.4" data-path="../nats_streaming/gettingstarted/tls.html">
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<a href="../nats_streaming/gettingstarted/tls.html">
|
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Securing
|
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</a>
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</li>
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<li class="chapter " data-level="8.5" data-path="../nats_streaming/gettingstarted/process-signaling.html">
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<a href="../nats_streaming/gettingstarted/process-signaling.html">
|
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Process Signaling
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</a>
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</li>
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<li class="chapter " data-level="8.6" data-path="../nats_streaming/gettingstarted/windows-service.html">
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<a href="../nats_streaming/gettingstarted/windows-service.html">
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Windows Service
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</a>
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</li>
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<li class="chapter " data-level="8.7" data-path="../developer/streaming/embedding.html">
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<a href="../developer/streaming/embedding.html">
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Embedding NATS Streaming Server
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</a>
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</li>
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<li class="chapter " data-level="8.8" data-path="../nats_streaming/swarm.html">
|
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<a href="../nats_streaming/swarm.html">
|
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Docker Swarm
|
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</a>
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</li>
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<li class="chapter " data-level="8.9" data-path="../nats_streaming/monitoring/monitoring.html">
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<a href="../nats_streaming/monitoring/monitoring.html">
|
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Monitoring
|
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</a>
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<ul class="articles">
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<li class="chapter " data-level="8.9.1" data-path="../nats_streaming/monitoring/enabling.html">
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<a href="../nats_streaming/monitoring/enabling.html">
|
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Enabling
|
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</a>
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</li>
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<li class="chapter " data-level="8.9.2" data-path="../nats_streaming/monitoring/endpoints.html">
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<a href="../nats_streaming/monitoring/endpoints.html">
|
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Endpoints
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</a>
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</li>
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</ul>
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</li>
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<li class="header">NATS Protocol</li>
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<li class="chapter " data-level="9.1" data-path="nats-protocol-demo.html">
|
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<a href="nats-protocol-demo.html">
|
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Protocol Demo
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</a>
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</li>
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<li class="chapter " data-level="9.2" data-path="nats-protocol.html">
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<a href="nats-protocol.html">
|
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|
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|
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Client Protocol
|
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</a>
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<ul class="articles">
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<li class="chapter active" data-level="9.2.1" data-path="nats-client-dev.html">
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<a href="nats-client-dev.html">
|
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Developing a Client
|
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="9.3" data-path="nats-server-protocol.html">
|
|
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<a href="nats-server-protocol.html">
|
|
|
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|
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NATS Cluster Protocol
|
|
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</a>
|
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</li>
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<li class="divider"></li>
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<li>
|
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<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
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Published with GitBook
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</a>
|
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</li>
|
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</ul>
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</nav>
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</div>
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<div class="book-body">
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >Developing a Client</a>
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<h2 id="nats-client-development-guide"><a name="nats-client-development-guide" class="plugin-anchor" href="#nats-client-development-guide"><i class="fa fa-link" aria-hidden="true"></i></a>NATS Client Development Guide</h2>
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<p>This guide provides you with considerations for developing NATS clients, including:</p>
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<ul>
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<li>CONNECT handling</li>
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<li>Authorization</li>
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<li>Verbose (acks)</li>
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<li>Pedantic mode</li>
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<li>Ping/pong interval</li>
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<li>Parsing the protocol</li>
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<li>Deciding on a parsing strategy</li>
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<li>Storing and dispatching subscription callbacks</li>
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<li>Implementing requests/response</li>
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<li>Error handling, disconnecting and reconnecting</li>
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<li>Cluster support</li>
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</ul>
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<p>Probably the best way to learn about implementing a client is to look at one of the client's maintained by the Synadia team. These clients are generally full featured, so if you can use them, that is even better, but if you have to write a client these may go beyond your needs while still capturing many of the design considerations discussed here.</p>
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<ul>
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<li><a href="https://github.com/nats-io/nats.go" target="_blank">go</a></li>
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<li><a href="https://github.com/nats-io/nats.js" target="_blank">node</a></li>
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<li><a href="https://github.com/nats-io/nats.ts" target="_blank">typescript</a></li>
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<li><a href="https://github.com/nats-io/nats.py2" target="_blank">python2</a></li>
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<li><a href="https://github.com/nats-io/nats.py" target="_blank">python asyncio</a></li>
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<li><a href="https://github.com/nats-io/nats.java" target="_blank">java</a></li>
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<li><a href="https://github.com/nats-io/nats.net" target="_blank">c#</a></li>
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<li><a href="https://github.com/nats-io/nats.rb" target="_blank">ruby</a></li>
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<li><a href="https://github.com/nats-io/nats.c" target="_blank">c</a></li>
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</ul>
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<h2 id="client-connection-options"><a name="client-connection-options" class="plugin-anchor" href="#client-connection-options"><i class="fa fa-link" aria-hidden="true"></i></a>Client connection options</h2>
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<p>Clients can connect in authenticated or unauthenticated mode, as well as verbose mode which enables acknowledgements. See the <a href="../documentation/internals/nats-protocol#CONNECT">protocol documentation</a> for details.</p>
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<h2 id="client-authorization"><a name="client-authorization" class="plugin-anchor" href="#client-authorization"><i class="fa fa-link" aria-hidden="true"></i></a>Client authorization</h2>
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<p>By default clients can connect to the server in unauthenticated mode. You can configure the NATS server to require password authentication to connect.</p>
|
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<p>For example, using the command line:</p>
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<pre class="language-"><code>nats-server -DV -m 8222 -user foo -pass bar
|
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</code></pre><p>The client must then authenticate to connect to the server. For example:</p>
|
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<pre class="language-"><code>nats.Connect("nats://foo:bar@localhost:4222")
|
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</code></pre><h2 id="verbose-mode"><a name="verbose-mode" class="plugin-anchor" href="#verbose-mode"><i class="fa fa-link" aria-hidden="true"></i></a>Verbose mode</h2>
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|
<p>When 'verbose' is enabled (via the <code>CONNECT</code> message), the NATS server will return <code>+OK</code> to acknowledge receipt of a valid protocol message. The NATS server automatically runs in verbose mode. Most client implementations disable verbose mode (set it to <code>false</code> in the <code>CONNECT</code> message) for performance reasons.</p>
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<h2 id="pedantic-mode"><a name="pedantic-mode" class="plugin-anchor" href="#pedantic-mode"><i class="fa fa-link" aria-hidden="true"></i></a>Pedantic mode</h2>
|
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<p>A client may also support 'pedantic' mode. Pedantic mode indicates to the server that strict protocol enforcement is required.</p>
|
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<h2 id="pingpong-interval"><a name="pingpong-interval" class="plugin-anchor" href="#pingpong-interval"><i class="fa fa-link" aria-hidden="true"></i></a>Ping/pong interval</h2>
|
|
<p>NATS implements auto-pruning. When a client connects to the server, the server expects that client to be active. Periodically, the NATS server pings each subscriber, expecting a reply. If there is no reply within the configurable time limit, the server disconnects the client.</p>
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<h2 id="parsing-the-protocol"><a name="parsing-the-protocol" class="plugin-anchor" href="#parsing-the-protocol"><i class="fa fa-link" aria-hidden="true"></i></a>Parsing the protocol</h2>
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<p>NATS provides a text-based message format. The text-based <a href="../documentation/internals/nats-protocol">protocol</a> makes it easy to implement NATS clients. The key consideration is deciding on a parsing strategy.</p>
|
|
<p>The NATS server implements a <a href="https://youtu.be/ylRKac5kSOk?t=10m46s" target="_blank">zero allocation byte parser</a> that is fast and efficient. Off the wire, a NATS message is simply a slice of bytes. Across the wire the message is transported as an immutable string over a TCP connection. It is up to the client to implement logic to parse the message.</p>
|
|
<p>The NATS message structure includes the Subject string, an optional Reply string, and an optional Data field that is a byte array. The type <code>Msg</code> is a structure used by Subscribers and PublishMsg().</p>
|
|
<pre class="language-"><code>type Msg struct {
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Subject string
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Reply string
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Data []byte
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Sub *Subscription
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}
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</code></pre><p>A NATS publisher publishes the data argument to the given subject. The data argument is left untouched and needs to be correctly interpreted on the receiver. How the client parses a NATS message depends on the programming language.</p>
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<h2 id="deciding-on-a-parsing-strategy"><a name="deciding-on-a-parsing-strategy" class="plugin-anchor" href="#deciding-on-a-parsing-strategy"><i class="fa fa-link" aria-hidden="true"></i></a>Deciding on a parsing strategy</h2>
|
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<p>Generally, protocol parsing for a NATS client is a string operation. In Python, for example, string operations are faster than regex. The Go and Java clients also use string operations to parse the message. But, if you look at the Ruby client, regex is used to parse the protocol because in Ruby regex is faster that string operations.</p>
|
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<p>In sum, there is no magic formula for parsing—it depends on the programming language. But, you need to take into consideration how you are going to parse the message when you write a client.</p>
|
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<h2 id="storing-and-dispatching-subscription-callbacks"><a name="storing-and-dispatching-subscription-callbacks" class="plugin-anchor" href="#storing-and-dispatching-subscription-callbacks"><i class="fa fa-link" aria-hidden="true"></i></a>Storing and dispatching subscription callbacks</h2>
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<p>When you make a subscription to the server, you need to store and dispatch callback handlers.</p>
|
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<p>On the client side, you need a hash map for this data structure. The hash map will be storing the callback that maps the subscription ID to the subscription.</p>
|
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<p>The key of the hash map is the subscription ID. The key is used to look up the callback in the hash map. When you process the NATS message off the wire, you pass the parameters subject, reply subject, and the payload to the callback handler, which does its work.</p>
|
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<p>Thus, you must store the mapping of subscription ID to the callback. Inside the subscription you have the callback.</p>
|
|
<h2 id="implementing-requestresponse"><a name="implementing-requestresponse" class="plugin-anchor" href="#implementing-requestresponse"><i class="fa fa-link" aria-hidden="true"></i></a>Implementing request/response</h2>
|
|
<p>When to use pub/sub vs. req/rep depends on your use case. Run the tutorials for each to understand the differences between each style of implementation.</p>
|
|
<h2 id="error-handling-disconnecting-and-reconnecting"><a name="error-handling-disconnecting-and-reconnecting" class="plugin-anchor" href="#error-handling-disconnecting-and-reconnecting"><i class="fa fa-link" aria-hidden="true"></i></a>Error handling, disconnecting and reconnecting</h2>
|
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<p>Considerations for error handling primarily include handling client disconnections and implementing retry logic.</p>
|
|
<h2 id="cluster-support"><a name="cluster-support" class="plugin-anchor" href="#cluster-support"><i class="fa fa-link" aria-hidden="true"></i></a>Cluster support</h2>
|
|
<p>The NATS client has reconnection logic. So, if you are implementing clustering, you need to implement reconnect callbacks a priori, meaning you cannot modify it during runtime. When you start it, you need to have that information already.</p>
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transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(5)~.tab__content:nth-of-type(5) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(6)~.tab__content:nth-of-type(6) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(7)~.tab__content:nth-of-type(7) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(8)~.tab__content:nth-of-type(8) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:first-of-type:not(:last-of-type)+label {
|
|
border-top-right-radius: 0;
|
|
border-bottom-right-radius: 0;
|
|
}
|
|
|
|
.tab:not(:first-of-type):not(:last-of-type)+label {
|
|
border-radius: 0;
|
|
}
|
|
|
|
.tab:last-of-type:not(:first-of-type)+label {
|
|
border-top-left-radius: 0;
|
|
border-bottom-left-radius: 0;
|
|
}
|
|
|
|
.tab:checked+label {
|
|
background-color: #fff;
|
|
box-shadow: 0 -1px 0 #fff inset;
|
|
cursor: default;
|
|
font-weight: bold;
|
|
border: 1px solid #ddd;
|
|
border-bottom-color: transparent;
|
|
}
|
|
|
|
.tab:checked+label:hover {
|
|
box-shadow: 0 -1px 0 #fff inset;
|
|
background-color: #fff;
|
|
}
|
|
|
|
.tab+label {
|
|
box-shadow: 0 -1px 0 #eee inset;
|
|
border-radius: 6px 6px 0 0;
|
|
cursor: pointer;
|
|
display: block;
|
|
text-decoration: none;
|
|
color: #27aae1;
|
|
flex-grow: 3;
|
|
text-align: center;
|
|
-webkit-user-select: none;
|
|
-moz-user-select: none;
|
|
-ms-user-select: none;
|
|
user-select: none;
|
|
text-align: center;
|
|
transition: 0.3s background-color ease, 0.3s box-shadow ease;
|
|
height: 50px;
|
|
box-sizing: border-box;
|
|
padding: 15px;
|
|
}
|
|
|
|
.tab+label:hover {
|
|
background-color: #f9f9f9;
|
|
box-shadow: 0 1px 0 #f4f4f4 inset;
|
|
}
|
|
|
|
.tab__content {
|
|
padding: 2px 2px;
|
|
background-color: transparent;
|
|
position: absolute;
|
|
width: 100%;
|
|
z-index: -1;
|
|
opacity: 0;
|
|
left: 0;
|
|
-webkit-transform: translateY(-3px);
|
|
transform: translateY(-3px);
|
|
border-radius: 6px;
|
|
}
|
|
|
|
.tab__content pre {
|
|
margin-bottom: 0px !important;
|
|
}
|
|
|
|
.toolbar-icons {
|
|
display: inline-block;
|
|
position: relative;
|
|
padding-left: 4px;
|
|
}
|
|
|
|
a.toolbar-icons {
|
|
text-decoration: none;
|
|
}
|
|
|
|
.toolbar-icons .mdi {
|
|
color: #4183c4;
|
|
}
|
|
|
|
.copy-msg {
|
|
color: #4183c4;
|
|
}
|
|
|
|
.pull-right {
|
|
float: right !important;
|
|
}
|
|
|
|
.pull-left {
|
|
float: left !important;
|
|
}
|
|
</style>
|
|
|
|
|
|
<script src="../gitbook/gitbook.js"></script>
|
|
<script src="../gitbook/theme.js"></script>
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-toggle-chapters/toggle.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-search/search-engine.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-search/search.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-lunr/lunr.min.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-lunr/search-lunr.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-sharing/buttons.js"></script>
|
|
|
|
|
|
|
|
<script src="../gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|
|
|