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Introduction
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What's New in 2.0
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FAQ
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nats.io
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<li class="header">Concepts</li>
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What is NATS
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Subject-Based Messaging
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Publish-Subscribe
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Request-Reply
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Queue Groups
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Acknowledgements
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Sequence Numbers
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Introduction
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Connecting
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Connecting to the Default Server
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Connecting to a Specific Server
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Connecting to a Cluster
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Setting a Connect Timeout
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Ping/Pong Protocol
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Controlling the Client/Server Protocol
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Turning Off Echo'd Messages
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Automatic Reconnections
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Disabling Reconnect
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Set the Number of Reconnect Attempts
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Pausing Between Reconnect Attempts
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Avoiding the Thundering Herd
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Listening for Reconnect Events
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Buffering Messages During Reconnect Attempts
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Securing Connections
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Authenticating with a User and Password
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Authenticating with a Token
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Authenticating with an NKey
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Authenticating with a Credentials File
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Encrypting Connections with TLS
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Receiving Messages
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Synchronous Subscriptions
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Asynchronous Subscriptions
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Unsubscribing
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Unsubscribing After N Messages
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Replying to a Message
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Wildcard Subscriptions
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Queue Subscriptions
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Draining Messages Before Disconnect
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Structured Data
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Sending Messages
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Including a Reply Subject
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<li class="chapter " data-level="3.6.2" data-path="../developer/sending/request_reply.html">
<a href="../developer/sending/request_reply.html">
Request-Reply Semantics
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<li class="chapter " data-level="3.6.3" data-path="../developer/sending/caches.html">
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Caches, Flush and Ping
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<li class="chapter " data-level="3.6.4" data-path="../developer/sending/structure.html">
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Sending Structured Data
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<li class="chapter " data-level="3.7" data-path="../developer/events/intro.html">
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Monitoring the Connection
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<li class="chapter " data-level="3.7.1" data-path="../developer/events/events.html">
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Listen for Connection Events
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Slow Consumers
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Tutorials
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Explore NATS Pub/Sub
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<a href="../developer/tutorials/reqreply.html">
Explore NATS Request/Reply
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Explore NATS Queueing
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Advanced Connect and Custom Dialer in Go
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<li class="header">NATS Server</li>
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Installing
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Running
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Window Service
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Clients
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Flags
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Configuration
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Securing NATS
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Enabling TLS
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Authentication
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Tokens
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Username/Password
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TLS Authentication
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NKeys
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Accounts
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JWTs
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Authentication Timeout
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Authorization
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Clustering
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Configuration
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TLS Authentication
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Gateways
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<a href="../gateways/gateway.html">
Configuration
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</ul>
</li>
<li class="chapter " data-level="4.5.4" data-path="../leafnodes/">
<a href="../leafnodes/">
Leaf Nodes
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<a href="../leafnodes/leafnode_conf.html">
Configuration
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</li>
</ul>
</li>
<li class="chapter " data-level="4.5.5" data-path="logging.html">
<a href="logging.html">
Logging
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<a href="monitoring.html">
Monitoring
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</li>
</ul>
</li>
<li class="chapter " data-level="4.6" data-path="../nats_admin/">
<a href="../nats_admin/">
Managing A NATS Server
</a>
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<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
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</li>
<li class="chapter " data-level="4.6.3" data-path="../nats_admin/signals.html">
<a href="../nats_admin/signals.html">
Signals
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</li>
<li class="chapter " data-level="4.6.4" data-path="../sys_accounts/">
<a href="../sys_accounts/">
System Accounts
</a>
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<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
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<li class="chapter " data-level="4.7.1" data-path="../nats_docker/nats-docker-tutorial.html">
<a href="../nats_docker/nats-docker-tutorial.html">
Tutorial
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</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
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</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
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<li class="chapter " data-level="5.3" data-path="../nats_tools/nsc/">
<a href="../nats_tools/nsc/">
nsc
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<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
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</li>
<li class="chapter " data-level="5.3.3" data-path="../nats_tools/nsc/services.html">
<a href="../nats_tools/nsc/services.html">
Services
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</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>
<li class="chapter " data-level="5.3.5" data-path="../nats_tools/nsc/revocation.html">
<a href="../nats_tools/nsc/revocation.html">
Revocation
</a>
</li>
<li class="chapter " data-level="5.3.6" data-path="../nats_tools/nsc/managed.html">
<a href="../nats_tools/nsc/managed.html">
Managed Operators
</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>
</li>
<li class="chapter " data-level="5.4.3" data-path="../nats_tools/nas/dir_store.html">
<a href="../nats_tools/nas/dir_store.html">
Directory Store
</a>
</li>
<li class="chapter " data-level="5.4.4" data-path="../nats_tools/nas/notifications.html">
<a href="../nats_tools/nas/notifications.html">
Update Notifications
</a>
</li>
<li class="chapter " data-level="5.4.5" data-path="../nats_tools/nas/mem_resolver.html">
<a href="../nats_tools/nas/mem_resolver.html">
Memory Resolver
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="5.5" data-path="../nats_tools/nats_top/">
<a href="../nats_tools/nats_top/">
nats-top
</a>
<ul class="articles">
<li class="chapter " data-level="5.5.1" data-path="../nats_tools/nats_top/nats-top-tutorial.html">
<a href="../nats_tools/nats_top/nats-top-tutorial.html">
Tutorial
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="5.6" data-path="../nats_tools/natsbench.html">
<a href="../nats_tools/natsbench.html">
nats-bench
</a>
</li>
<li class="header">NATS Streaming Concepts</li>
<li class="chapter " data-level="6.1" data-path="../nats_streaming/intro.html">
<a href="../nats_streaming/intro.html">
Introduction
</a>
</li>
<li class="chapter " data-level="6.2" data-path="../nats_streaming/relation-to-nats.html">
<a href="../nats_streaming/relation-to-nats.html">
Relation to NATS
</a>
</li>
<li class="chapter " data-level="6.3" data-path="../nats_streaming/client-connections.html">
<a href="../nats_streaming/client-connections.html">
Client Connections
</a>
</li>
<li class="chapter " data-level="6.4" data-path="../nats_streaming/channels/channels.html">
<a href="../nats_streaming/channels/channels.html">
Channels
</a>
<ul class="articles">
<li class="chapter " data-level="6.4.1" data-path="../nats_streaming/channels/message-log.html">
<a href="../nats_streaming/channels/message-log.html">
Message Log
</a>
</li>
<li class="chapter " data-level="6.4.2" data-path="../nats_streaming/channels/subscriptions/subscriptions.html">
<a href="../nats_streaming/channels/subscriptions/subscriptions.html">
Subscriptions
</a>
<ul class="articles">
<li class="chapter " data-level="6.4.2.1" data-path="../nats_streaming/channels/subscriptions/regular.html">
<a href="../nats_streaming/channels/subscriptions/regular.html">
Regular
</a>
</li>
<li class="chapter " data-level="6.4.2.2" data-path="../nats_streaming/channels/subscriptions/durable.html">
<a href="../nats_streaming/channels/subscriptions/durable.html">
Durable
</a>
</li>
<li class="chapter " data-level="6.4.2.3" data-path="../nats_streaming/channels/subscriptions/queue-group.html">
<a href="../nats_streaming/channels/subscriptions/queue-group.html">
Queue Group
</a>
</li>
<li class="chapter " data-level="6.4.2.4" data-path="../nats_streaming/channels/subscriptions/redelivery.html">
<a href="../nats_streaming/channels/subscriptions/redelivery.html">
Redelivery
</a>
</li>
</ul>
</li>
</ul>
</li>
<li class="chapter " data-level="6.5" data-path="../nats_streaming/store-interface.html">
<a href="../nats_streaming/store-interface.html">
Store Interface
</a>
</li>
<li class="chapter " data-level="6.6" data-path="../nats_streaming/store-encryption.html">
<a href="../nats_streaming/store-encryption.html">
Store Encryption
</a>
</li>
<li class="chapter " data-level="6.7" data-path="../nats_streaming/clustering/clustering.html">
<a href="../nats_streaming/clustering/clustering.html">
Clustering
</a>
<ul class="articles">
<li class="chapter " data-level="6.7.1" data-path="../nats_streaming/clustering/supported-stores.html">
<a href="../nats_streaming/clustering/supported-stores.html">
Supported Stores
</a>
</li>
<li class="chapter " data-level="6.7.2" data-path="../nats_streaming/clustering/configuration.html">
<a href="../nats_streaming/clustering/configuration.html">
Configuration
</a>
</li>
<li class="chapter " data-level="6.7.3" data-path="../nats_streaming/clustering/auto-configuration.html">
<a href="../nats_streaming/clustering/auto-configuration.html">
Auto Configuration
</a>
</li>
<li class="chapter " data-level="6.7.4" data-path="../nats_streaming/clustering/containers.html">
<a href="../nats_streaming/clustering/containers.html">
Containers
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="6.8" data-path="../nats_streaming/fault-tolerance/ft.html">
<a href="../nats_streaming/fault-tolerance/ft.html">
Fault Tolerance
</a>
<ul class="articles">
<li class="chapter " data-level="6.8.1" data-path="../nats_streaming/fault-tolerance/active-server.html">
<a href="../nats_streaming/fault-tolerance/active-server.html">
Active Server
</a>
</li>
<li class="chapter " data-level="6.8.2" data-path="../nats_streaming/fault-tolerance/standby-server.html">
<a href="../nats_streaming/fault-tolerance/standby-server.html">
Standby Servers
</a>
</li>
<li class="chapter " data-level="6.8.3" data-path="../nats_streaming/fault-tolerance/shared-state.html">
<a href="../nats_streaming/fault-tolerance/shared-state.html">
Shared State
</a>
</li>
<li class="chapter " data-level="6.8.4" data-path="../nats_streaming/fault-tolerance/failover.html">
<a href="../nats_streaming/fault-tolerance/failover.html">
Failover
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="6.9" data-path="../nats_streaming/partitioning.html">
<a href="../nats_streaming/partitioning.html">
Partitioning
</a>
</li>
<li class="chapter " data-level="6.10" data-path="../nats_streaming/monitoring/monitoring.html">
<a href="../nats_streaming/monitoring/monitoring.html">
Monitoring
</a>
<ul class="articles">
<li class="chapter " data-level="6.10.1" data-path="../nats_streaming/monitoring/endpoints.html">
<a href="../nats_streaming/monitoring/endpoints.html">
Endpoints
</a>
</li>
</ul>
</li>
<li class="header">Developing With NATS Streaming</li>
<li class="chapter " data-level="7.1" data-path="../developer/streaming/">
<a href="../developer/streaming/">
Introduction
</a>
</li>
<li class="chapter " data-level="7.2" data-path="../developer/streaming/connecting.html">
<a href="../developer/streaming/connecting.html">
Connecting to NATS Streaming
</a>
</li>
<li class="chapter " data-level="7.3" data-path="../developer/streaming/publishing.html">
<a href="../developer/streaming/publishing.html">
Publishing to a Channel
</a>
</li>
<li class="chapter " data-level="7.4" data-path="../developer/streaming/receiving.html">
<a href="../developer/streaming/receiving.html">
Receiving Messages from a Channel
</a>
</li>
<li class="chapter " data-level="7.5" data-path="../developer/streaming/durables.html">
<a href="../developer/streaming/durables.html">
Durable Subscriptions
</a>
</li>
<li class="chapter " data-level="7.6" data-path="../developer/streaming/queues.html">
<a href="../developer/streaming/queues.html">
Queue Subscriptions
</a>
</li>
<li class="chapter " data-level="7.7" data-path="../developer/streaming/acks.html">
<a href="../developer/streaming/acks.html">
Acknowledgements
</a>
</li>
<li class="chapter " data-level="7.8" data-path="../developer/streaming/protocol.html">
<a href="../developer/streaming/protocol.html">
The Streaming Protocol
</a>
</li>
<li class="header">NATS Streaming Server</li>
<li class="chapter " data-level="8.1" data-path="../nats_streaming/gettingstarted/changes.html">
<a href="../nats_streaming/gettingstarted/changes.html">
Important Changes
</a>
</li>
<li class="chapter " data-level="8.2" data-path="../nats_streaming/gettingstarted/install.html">
<a href="../nats_streaming/gettingstarted/install.html">
Installing
</a>
</li>
<li class="chapter " data-level="8.3" data-path="../nats_streaming/gettingstarted/run.html">
<a href="../nats_streaming/gettingstarted/run.html">
Running
</a>
</li>
<li class="chapter " data-level="8.4" data-path="../nats_streaming/configuring/configuring.html">
<a href="../nats_streaming/configuring/configuring.html">
Configuring
</a>
<ul class="articles">
<li class="chapter " data-level="8.4.1" data-path="../nats_streaming/configuring/cmdline.html">
<a href="../nats_streaming/configuring/cmdline.html">
Command line arguments
</a>
</li>
<li class="chapter " data-level="8.4.2" data-path="../nats_streaming/configuring/cfgfile.html">
<a href="../nats_streaming/configuring/cfgfile.html">
Configuration file
</a>
</li>
<li class="chapter " data-level="8.4.3" data-path="../nats_streaming/configuring/storelimits.html">
<a href="../nats_streaming/configuring/storelimits.html">
Store Limits
</a>
<ul class="articles">
<li class="chapter " data-level="8.4.3.1" data-path="../nats_streaming/configuring/storelimits.html">
<a href="../nats_streaming/configuring/storelimits.html#limits-inheritance">
Limits inheritance
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="8.4.4" data-path="../nats_streaming/configuring/persistence.html">
<a href="../nats_streaming/configuring/persistence.html">
Persistence
</a>
<ul class="articles">
<li class="chapter " data-level="8.4.4.1" data-path="../nats_streaming/configuring/filestore.html">
<a href="../nats_streaming/configuring/filestore.html">
File Store
</a>
<ul class="articles">
<li class="chapter " data-level="8.4.4.1.1" data-path="../nats_streaming/configuring/filestore.html">
<a href="../nats_streaming/configuring/filestore.html#options">
Options
</a>
</li>
<li class="chapter " data-level="8.4.4.1.2" data-path="../nats_streaming/configuring/filestore.html">
<a href="../nats_streaming/configuring/filestore.html#recovery-errors">
Recovery Errors
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="8.4.4.2" data-path="../nats_streaming/configuring/sqlstore.html">
<a href="../nats_streaming/configuring/sqlstore.html">
SQL Store
</a>
<ul class="articles">
<li class="chapter " data-level="8.4.4.2.1" data-path="../nats_streaming/configuring/sqlstore.html">
<a href="../nats_streaming/configuring/sqlstore.html#read-and-write-timeouts">
Read and Write Timeouts
</a>
</li>
<li class="chapter " data-level="8.4.4.2.2" data-path="../nats_streaming/configuring/sqlstore.html">
<a href="../nats_streaming/configuring/sqlstore.html#options">
Options
</a>
</li>
</ul>
</li>
</ul>
</li>
<li class="chapter " data-level="8.4.5" data-path="../nats_streaming/configuring/tls.html">
<a href="../nats_streaming/configuring/tls.html">
Securing
</a>
<ul class="articles">
<li class="chapter " data-level="8.4.5.1" data-path="../nats_streaming/configuring/tls.html">
<a href="../nats_streaming/configuring/tls.html#authenticating-users">
Authenticating Users
</a>
</li>
<li class="chapter " data-level="8.4.5.2" data-path="../nats_streaming/configuring/tls.html">
<a href="../nats_streaming/configuring/tls.html#using-tls">
TLS
</a>
</li>
</ul>
</li>
</ul>
</li>
<li class="chapter " data-level="8.5" data-path="../nats_streaming/gettingstarted/process-signaling.html">
<a href="../nats_streaming/gettingstarted/process-signaling.html">
Process Signaling
</a>
</li>
<li class="chapter " data-level="8.6" data-path="../nats_streaming/gettingstarted/windows-service.html">
<a href="../nats_streaming/gettingstarted/windows-service.html">
Windows Service
</a>
</li>
<li class="chapter " data-level="8.7" data-path="../developer/streaming/embedding.html">
<a href="../developer/streaming/embedding.html">
Embedding NATS Streaming Server
</a>
</li>
<li class="chapter " data-level="8.8" data-path="../nats_streaming/swarm.html">
<a href="../nats_streaming/swarm.html">
Docker Swarm
</a>
</li>
<li class="header">NATS Protocol</li>
<li class="chapter " data-level="9.1" data-path="../nats_protocol/nats-protocol-demo.html">
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Protocol Demo
</a>
</li>
<li class="chapter " data-level="9.2" data-path="../nats_protocol/nats-protocol.html">
<a href="../nats_protocol/nats-protocol.html">
Client Protocol
</a>
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<li class="chapter " data-level="9.2.1" data-path="../nats_protocol/nats-client-dev.html">
<a href="../nats_protocol/nats-client-dev.html">
Developing a Client
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="9.3" data-path="../nats_protocol/nats-server-protocol.html">
<a href="../nats_protocol/nats-server-protocol.html">
NATS Cluster Protocol
</a>
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<a href=".." >Monitoring</a>
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<h2 id="monitoring-nats"><a name="monitoring-nats" class="plugin-anchor" href="#monitoring-nats"><i class="fa fa-link" aria-hidden="true"></i></a>Monitoring NATS</h2>
<p>To monitor the NATS messaging system, <code>nats-server</code> provides a lightweight HTTP server on a dedicated monitoring port.
The monitoring server provides several endpoints, providing statistics and other information about the following:</p>
<ul>
<li><a href="#general-information">General Server Information</a></li>
<li><a href="#connection-information">Connections</a></li>
<li><a href="#route-information">Routing</a></li>
<li><a href="#gateway-information">Gateways</a></li>
<li><a href="#leaf-nodes-information">Leaf Nodes</a></li>
<li><a href="#subscription-routing-information">Subscription Routing</a></li>
</ul>
<p>All endpoints return a JSON object.</p>
<p>The NATS monitoring endpoints support JSONP and CORS, making it easy to create single page monitoring web applications.</p>
<h3 id="enabling-monitoring-from-the-command-line"><a name="enabling-monitoring-from-the-command-line" class="plugin-anchor" href="#enabling-monitoring-from-the-command-line"><i class="fa fa-link" aria-hidden="true"></i></a>Enabling monitoring from the command line</h3>
<p>To enable the monitoring server, start the NATS server with the monitoring flag <code>-m</code> and the monitoring port, or turn it on in the <a href="configuration.html#configuration-properties">configuration file</a>.</p>
<pre class="language-"><code>-m, --http_port PORT HTTP PORT for monitoring
-ms,--https_port PORT Use HTTPS PORT for monitoring
</code></pre><p>Example:</p>
<pre class="language-"><code class="lang-sh">$ nats-server -m <span class="token number">8222</span>
<span class="token punctuation">[</span><span class="token number">4528</span><span class="token punctuation">]</span> <span class="token number">2019</span>/06/01 <span class="token number">20</span>:09:58.572939 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> Starting nats-server version <span class="token number">2.0</span>.0
<span class="token punctuation">[</span><span class="token number">4528</span><span class="token punctuation">]</span> <span class="token number">2019</span>/06/01 <span class="token number">20</span>:09:58.573007 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> Starting http monitor on port <span class="token number">8222</span>
<span class="token punctuation">[</span><span class="token number">4528</span><span class="token punctuation">]</span> <span class="token number">2019</span>/06/01 <span class="token number">20</span>:09:58.573071 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> Listening <span class="token keyword">for</span> client connections on <span class="token number">0.0</span>.0.0:4222
<span class="token punctuation">[</span><span class="token number">4528</span><span class="token punctuation">]</span> <span class="token number">2019</span>/06/01 <span class="token number">20</span>:09:58.573090 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> nats-server is ready<span class="token operator">&lt;</span>/td<span class="token operator">&gt;</span>
</code></pre>
<p>To test, run <code>nats-server -m 8222</code>, then go to <a href="http://demo.nats.io:8222/" target="_blank">http://demo.nats.io:8222/</a></p>
<h3 id="enable-monitoring-from-the-configuration-file"><a name="enable-monitoring-from-the-configuration-file" class="plugin-anchor" href="#enable-monitoring-from-the-configuration-file"><i class="fa fa-link" aria-hidden="true"></i></a>Enable monitoring from the configuration file</h3>
<p>You can also enable monitoring using the configuration file as follows:</p>
<pre class="language-"><code class="lang-yaml"><span class="token key atrule">http_port</span><span class="token punctuation">:</span> <span class="token number">8222</span>
</code></pre>
<p>For example, to monitor this server locally, the endpoint would be <a href="http://demo.nats.io:8222/varz" target="_blank">http://demo.nats.io:8222/varz</a> reports various general statistics.</p>
<h2 id="monitoring-endpoints"><a name="monitoring-endpoints" class="plugin-anchor" href="#monitoring-endpoints"><i class="fa fa-link" aria-hidden="true"></i></a>Monitoring endpoints</h2>
<p>The following sections describe each supported monitoring endpoint: <code>varz</code>, <code>connz</code>, <code>routez</code>, <code>subsz</code>, and <code>gatewayz</code>.
There are not any required arguments, however use of arguments can let you tailor monitoring to your environment
and tooling.</p>
<h3 id="general-information"><a name="general-information" class="plugin-anchor" href="#general-information"><i class="fa fa-link" aria-hidden="true"></i></a>General Information</h3>
<p>The <code>/varz</code> endpoint returns general information about the server state and configuration.</p>
<p><strong>Endpoint:</strong> <code>http://server:port/varz</code></p>
<table>
<thead>
<tr>
<th style="text-align:left">Result</th>
<th style="text-align:left">Return Code</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">Success</td>
<td style="text-align:left">200 (OK)</td>
</tr>
<tr>
<td style="text-align:left">Error</td>
<td style="text-align:left">400 (Bad Request)</td>
</tr>
</tbody>
</table>
<h4 id="arguments"><a name="arguments" class="plugin-anchor" href="#arguments"><i class="fa fa-link" aria-hidden="true"></i></a>Arguments</h4>
<p>N/A</p>
<h4 id="example"><a name="example" class="plugin-anchor" href="#example"><i class="fa fa-link" aria-hidden="true"></i></a>Example</h4>
<p><a href="http://demo.nats.io:8222/varz" target="_blank">http://demo.nats.io:8222/varz</a></p>
<h4 id="response"><a name="response" class="plugin-anchor" href="#response"><i class="fa fa-link" aria-hidden="true"></i></a>Response</h4>
<pre class="language-"><code class="lang-json"><span class="token punctuation">{</span>
<span class="token property">&quot;server_id&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NACDVKFBUW4C4XA24OOT6L4MDP56MW76J5RJDFXG7HLABSB46DCMWCOW&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;version&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2.0.0&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;proto&quot;</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token property">&quot;go&quot;</span><span class="token operator">:</span> <span class="token string">&quot;go1.12&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;host&quot;</span><span class="token operator">:</span> <span class="token string">&quot;0.0.0.0&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;port&quot;</span><span class="token operator">:</span> <span class="token number">4222</span><span class="token punctuation">,</span>
<span class="token property">&quot;max_connections&quot;</span><span class="token operator">:</span> <span class="token number">65536</span><span class="token punctuation">,</span>
<span class="token property">&quot;ping_interval&quot;</span><span class="token operator">:</span> <span class="token number">120000000000</span><span class="token punctuation">,</span>
<span class="token property">&quot;ping_max&quot;</span><span class="token operator">:</span> <span class="token number">2</span><span class="token punctuation">,</span>
<span class="token property">&quot;http_host&quot;</span><span class="token operator">:</span> <span class="token string">&quot;0.0.0.0&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;http_port&quot;</span><span class="token operator">:</span> <span class="token number">8222</span><span class="token punctuation">,</span>
<span class="token property">&quot;https_port&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;auth_timeout&quot;</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token property">&quot;max_control_line&quot;</span><span class="token operator">:</span> <span class="token number">4096</span><span class="token punctuation">,</span>
<span class="token property">&quot;max_payload&quot;</span><span class="token operator">:</span> <span class="token number">1048576</span><span class="token punctuation">,</span>
<span class="token property">&quot;max_pending&quot;</span><span class="token operator">:</span> <span class="token number">67108864</span><span class="token punctuation">,</span>
<span class="token property">&quot;cluster&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token property">&quot;gateway&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token property">&quot;leaf&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token property">&quot;tls_timeout&quot;</span><span class="token operator">:</span> <span class="token number">0.5</span><span class="token punctuation">,</span>
<span class="token property">&quot;write_deadline&quot;</span><span class="token operator">:</span> <span class="token number">2000000000</span><span class="token punctuation">,</span>
<span class="token property">&quot;start&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-06-24T14:24:43.928582-07:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;now&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-06-24T14:24:46.894852-07:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;uptime&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;mem&quot;</span><span class="token operator">:</span> <span class="token number">9617408</span><span class="token punctuation">,</span>
<span class="token property">&quot;cores&quot;</span><span class="token operator">:</span> <span class="token number">4</span><span class="token punctuation">,</span>
<span class="token property">&quot;cpu&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;connections&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;total_connections&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;routes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;remotes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;leafnodes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;slow_consumers&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;http_req_stats&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token property">&quot;/&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;/connz&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;/gatewayz&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;/routez&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;/subsz&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;/varz&quot;</span><span class="token operator">:</span> <span class="token number">1</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token property">&quot;config_load_time&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-06-24T14:24:43.928582-07:00&quot;</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="connection-information"><a name="connection-information" class="plugin-anchor" href="#connection-information"><i class="fa fa-link" aria-hidden="true"></i></a>Connection Information</h3>
<p>The <code>/connz</code> endpoint reports more detailed information on current and recently closed connections.
It uses a paging mechanism which defaults to 1024 connections.</p>
<p><strong>Endpoint:</strong> <code>http://server:port/connz</code></p>
<table>
<thead>
<tr>
<th style="text-align:left">Result</th>
<th style="text-align:left">Return Code</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">Success</td>
<td style="text-align:left">200 (OK)</td>
</tr>
<tr>
<td style="text-align:left">Error</td>
<td style="text-align:left">400 (Bad Request)</td>
</tr>
</tbody>
</table>
<h4 id="arguments"><a name="arguments" class="plugin-anchor" href="#arguments"><i class="fa fa-link" aria-hidden="true"></i></a>Arguments</h4>
<table>
<thead>
<tr>
<th style="text-align:left">Argument</th>
<th style="text-align:left">Values</th>
<th style="text-align:left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">sort</td>
<td style="text-align:left">(<em>see sort options</em>)</td>
<td style="text-align:left">Sorts the results. Default is connection ID.</td>
</tr>
<tr>
<td style="text-align:left">auth</td>
<td style="text-align:left">true, 1, false, 0</td>
<td style="text-align:left">Include username. Default is false.</td>
</tr>
<tr>
<td style="text-align:left">subs</td>
<td style="text-align:left">true, 1, false, 0</td>
<td style="text-align:left">Include subscriptions. Default is false.</td>
</tr>
<tr>
<td style="text-align:left">offset</td>
<td style="text-align:left">number &gt; 0</td>
<td style="text-align:left">Pagination offset. Default is 0.</td>
</tr>
<tr>
<td style="text-align:left">limit</td>
<td style="text-align:left">number &gt; 0</td>
<td style="text-align:left">Number of results to return. Default is 1024.</td>
</tr>
<tr>
<td style="text-align:left">cid</td>
<td style="text-align:left">number, valid id</td>
<td style="text-align:left">Return a connection by it&apos;s id</td>
</tr>
<tr>
<td style="text-align:left">state</td>
<td style="text-align:left">open, *closed, any</td>
<td style="text-align:left">Return connections of partular state. Default is open.</td>
</tr>
</tbody>
</table>
<p><em>The server will default to holding the last 10,000 closed connections.</em></p>
<h5 id="sort-options"><a name="sort-options" class="plugin-anchor" href="#sort-options"><i class="fa fa-link" aria-hidden="true"></i></a>Sort Options</h5>
<table>
<thead>
<tr>
<th style="text-align:left">Option</th>
<th style="text-align:left">Sort by</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">cid</td>
<td style="text-align:left">Connection ID</td>
</tr>
<tr>
<td style="text-align:left">start</td>
<td style="text-align:left">Connection start time, same as CID</td>
</tr>
<tr>
<td style="text-align:left">subs</td>
<td style="text-align:left">Number of subscriptions</td>
</tr>
<tr>
<td style="text-align:left">pending</td>
<td style="text-align:left">Amount of data in bytes waiting to be sent to client</td>
</tr>
<tr>
<td style="text-align:left">msgs_to</td>
<td style="text-align:left">Number of messages sent</td>
</tr>
<tr>
<td style="text-align:left">msgs_from</td>
<td style="text-align:left">Number of messages received</td>
</tr>
<tr>
<td style="text-align:left">bytes_to</td>
<td style="text-align:left">Number of bytes sent</td>
</tr>
<tr>
<td style="text-align:left">bytes_from</td>
<td style="text-align:left">Number of bytes received</td>
</tr>
<tr>
<td style="text-align:left">last</td>
<td style="text-align:left">Last activity</td>
</tr>
<tr>
<td style="text-align:left">idle</td>
<td style="text-align:left">Amount of inactivity</td>
</tr>
<tr>
<td style="text-align:left">uptime</td>
<td style="text-align:left">Lifetime of the connection</td>
</tr>
<tr>
<td style="text-align:left">stop</td>
<td style="text-align:left">Stop time for a closed connection</td>
</tr>
<tr>
<td style="text-align:left">reason</td>
<td style="text-align:left">Reason for a closed connection</td>
</tr>
</tbody>
</table>
<h4 id="examples"><a name="examples" class="plugin-anchor" href="#examples"><i class="fa fa-link" aria-hidden="true"></i></a>Examples</h4>
<p>Get up to 1024 connections: <a href="http://demo.nats.io:8222/connz" target="_blank">http://demo.nats.io:8222/connz</a></p>
<p>Control limit and offset: <a href="http://demo.nats.io:8222/connz?limit=16&amp;offset=128" target="_blank">http://demo.nats.io:8222/connz?limit=16&amp;offset=128</a>.</p>
<p>Get closed connection information: <a href="http://demo.nats.io:8222/connz?state=closed" target="_blank">http://demo.nats.io:8222/connz?state=closed</a>.</p>
<p>You can also report detailed subscription information on a per connection basis using subs=1. For example: <a href="http://demo.nats.io:8222/connz?limit=1&amp;offset=1&amp;subs=1" target="_blank">http://demo.nats.io:8222/connz?limit=1&amp;offset=1&amp;subs=1</a>.</p>
<h4 id="response"><a name="response" class="plugin-anchor" href="#response"><i class="fa fa-link" aria-hidden="true"></i></a>Response</h4>
<pre class="language-"><code class="lang-json"><span class="token punctuation">{</span>
<span class="token property">&quot;server_id&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NACDVKFBUW4C4XA24OOT6L4MDP56MW76J5RJDFXG7HLABSB46DCMWCOW&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;now&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-06-24T14:28:16.520365-07:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;num_connections&quot;</span><span class="token operator">:</span> <span class="token number">2</span><span class="token punctuation">,</span>
<span class="token property">&quot;total&quot;</span><span class="token operator">:</span> <span class="token number">2</span><span class="token punctuation">,</span>
<span class="token property">&quot;offset&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;limit&quot;</span><span class="token operator">:</span> <span class="token number">1024</span><span class="token punctuation">,</span>
<span class="token property">&quot;connections&quot;</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
<span class="token property">&quot;cid&quot;</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token property">&quot;ip&quot;</span><span class="token operator">:</span> <span class="token string">&quot;127.0.0.1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;port&quot;</span><span class="token operator">:</span> <span class="token number">49764</span><span class="token punctuation">,</span>
<span class="token property">&quot;start&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-06-24T14:27:25.94611-07:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;last_activity&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-06-24T14:27:25.954046-07:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;rtt&quot;</span><span class="token operator">:</span> <span class="token string">&quot;275&#xB5;s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;uptime&quot;</span><span class="token operator">:</span> <span class="token string">&quot;50s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;idle&quot;</span><span class="token operator">:</span> <span class="token string">&quot;50s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;pending_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions&quot;</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token property">&quot;name&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NATS Sample Subscriber&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;lang&quot;</span><span class="token operator">:</span> <span class="token string">&quot;go&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;version&quot;</span><span class="token operator">:</span> <span class="token string">&quot;1.8.1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions_list&quot;</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token string">&quot;hello.world&quot;</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>
<span class="token property">&quot;cid&quot;</span><span class="token operator">:</span> <span class="token number">2</span><span class="token punctuation">,</span>
<span class="token property">&quot;ip&quot;</span><span class="token operator">:</span> <span class="token string">&quot;127.0.0.1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;port&quot;</span><span class="token operator">:</span> <span class="token number">49767</span><span class="token punctuation">,</span>
<span class="token property">&quot;start&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-06-24T14:27:43.403923-07:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;last_activity&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-06-24T14:27:43.406568-07:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;rtt&quot;</span><span class="token operator">:</span> <span class="token string">&quot;96&#xB5;s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;uptime&quot;</span><span class="token operator">:</span> <span class="token string">&quot;33s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;idle&quot;</span><span class="token operator">:</span> <span class="token string">&quot;33s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;pending_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions&quot;</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token property">&quot;name&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NATS Sample Subscriber&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;lang&quot;</span><span class="token operator">:</span> <span class="token string">&quot;go&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;version&quot;</span><span class="token operator">:</span> <span class="token string">&quot;1.8.1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions_list&quot;</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token string">&quot;foo.bar&quot;</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="route-information"><a name="route-information" class="plugin-anchor" href="#route-information"><i class="fa fa-link" aria-hidden="true"></i></a>Route Information</h3>
<p>The <code>/routez</code> endpoint reports information on active routes for a cluster.
Routes are expected to be low, so there is no paging mechanism with this endpoint.</p>
<p><strong>Endpoint:</strong> <code>http://server:port/routez</code></p>
<table>
<thead>
<tr>
<th style="text-align:left">Result</th>
<th style="text-align:left">Return Code</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">Success</td>
<td style="text-align:left">200 (OK)</td>
</tr>
<tr>
<td style="text-align:left">Error</td>
<td style="text-align:left">400 (Bad Request)</td>
</tr>
</tbody>
</table>
<h4 id="arguments"><a name="arguments" class="plugin-anchor" href="#arguments"><i class="fa fa-link" aria-hidden="true"></i></a>Arguments</h4>
<table>
<thead>
<tr>
<th style="text-align:left">Argument</th>
<th style="text-align:left">Values</th>
<th style="text-align:left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">subs</td>
<td style="text-align:left">true, 1, false, 0</td>
<td style="text-align:left">Include internal subscriptions. Default is false.</td>
</tr>
</tbody>
</table>
<p>As noted above, the <code>routez</code> endpoint does support the <code>subs</code> argument from the <code>/connz</code> endpoint. For example: <a href="http://demo.nats.io:8222/routez?subs=1" target="_blank">http://demo.nats.io:8222/routez?subs=1</a></p>
<h4 id="example"><a name="example" class="plugin-anchor" href="#example"><i class="fa fa-link" aria-hidden="true"></i></a>Example</h4>
<ul>
<li>Get route information: <a href="http://demo.nats.io:8222/routez?subs=1" target="_blank">http://demo.nats.io:8222/routez?subs=1</a></li>
</ul>
<h4 id="response"><a name="response" class="plugin-anchor" href="#response"><i class="fa fa-link" aria-hidden="true"></i></a>Response</h4>
<pre class="language-"><code class="lang-json"><span class="token punctuation">{</span>
<span class="token property">&quot;server_id&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NACDVKFBUW4C4XA24OOT6L4MDP56MW76J5RJDFXG7HLABSB46DCMWCOW&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;now&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-06-24T14:29:16.046656-07:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;num_routes&quot;</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token property">&quot;routes&quot;</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
<span class="token property">&quot;rid&quot;</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token property">&quot;remote_id&quot;</span><span class="token operator">:</span> <span class="token string">&quot;de475c0041418afc799bccf0fdd61b47&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;did_solicit&quot;</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
<span class="token property">&quot;ip&quot;</span><span class="token operator">:</span> <span class="token string">&quot;127.0.0.1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;port&quot;</span><span class="token operator">:</span> <span class="token number">61791</span><span class="token punctuation">,</span>
<span class="token property">&quot;pending_size&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions&quot;</span><span class="token operator">:</span> <span class="token number">0</span>
<span class="token punctuation">}</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="gateway-information"><a name="gateway-information" class="plugin-anchor" href="#gateway-information"><i class="fa fa-link" aria-hidden="true"></i></a>Gateway Information</h3>
<p>The <code>/gatewayz</code> endpoint reports information about gateways used to create a NATS supercluster.
Like routes, the number of gateways are expected to be low, so there is no paging mechanism with this endpoint.</p>
<p><strong>Endpoint:</strong> <code>http://server:port/gatewayz</code></p>
<table>
<thead>
<tr>
<th style="text-align:left">Result</th>
<th style="text-align:left">Return Code</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">Success</td>
<td style="text-align:left">200 (OK)</td>
</tr>
<tr>
<td style="text-align:left">Error</td>
<td style="text-align:left">400 (Bad Request)</td>
</tr>
</tbody>
</table>
<h4 id="arguments"><a name="arguments" class="plugin-anchor" href="#arguments"><i class="fa fa-link" aria-hidden="true"></i></a>Arguments</h4>
<table>
<thead>
<tr>
<th style="text-align:left">Argument</th>
<th style="text-align:left">Values</th>
<th style="text-align:left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">accs</td>
<td style="text-align:left">true, 1, false, 0</td>
<td style="text-align:left">Include account information. Default is false.</td>
</tr>
<tr>
<td style="text-align:left">gw_name</td>
<td style="text-align:left">string</td>
<td style="text-align:left">Return only remote gateways with this name.</td>
</tr>
<tr>
<td style="text-align:left">acc_name</td>
<td style="text-align:left">string</td>
<td style="text-align:left">Limit the list of accounts to this account name.</td>
</tr>
</tbody>
</table>
<h4 id="examples"><a name="examples" class="plugin-anchor" href="#examples"><i class="fa fa-link" aria-hidden="true"></i></a>Examples</h4>
<ul>
<li>Retrieve Gateway Information: <a href="http://demo.nats.io:8222/gatewayz" target="_blank">http://demo.nats.io:8222/gatewayz</a></li>
</ul>
<h4 id="response"><a name="response" class="plugin-anchor" href="#response"><i class="fa fa-link" aria-hidden="true"></i></a>Response</h4>
<pre class="language-"><code class="lang-json"><span class="token punctuation">{</span>
<span class="token property">&quot;server_id&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NANVBOU62MDUWTXWRQ5KH3PSMYNCHCEUHQV3TW3YH7WZLS7FMJE6END6&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;now&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-07-24T18:02:55.597398-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;name&quot;</span><span class="token operator">:</span> <span class="token string">&quot;region1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;host&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2601:283:4601:1350:1895:efda:2010:95a1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;port&quot;</span><span class="token operator">:</span> <span class="token number">4501</span><span class="token punctuation">,</span>
<span class="token property">&quot;outbound_gateways&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token property">&quot;region2&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token property">&quot;configured&quot;</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
<span class="token property">&quot;connection&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token property">&quot;cid&quot;</span><span class="token operator">:</span> <span class="token number">7</span><span class="token punctuation">,</span>
<span class="token property">&quot;ip&quot;</span><span class="token operator">:</span> <span class="token string">&quot;127.0.0.1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;port&quot;</span><span class="token operator">:</span> <span class="token number">5500</span><span class="token punctuation">,</span>
<span class="token property">&quot;start&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-07-24T18:02:48.765621-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;last_activity&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-07-24T18:02:48.765621-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;uptime&quot;</span><span class="token operator">:</span> <span class="token string">&quot;6s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;idle&quot;</span><span class="token operator">:</span> <span class="token string">&quot;6s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;pending_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;name&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NCXBIYWT7MV7OAQTCR4QTKBN3X3HDFGSFWTURTCQ22ZZB6NKKJPO7MN4&quot;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token property">&quot;region3&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token property">&quot;configured&quot;</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
<span class="token property">&quot;connection&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token property">&quot;cid&quot;</span><span class="token operator">:</span> <span class="token number">5</span><span class="token punctuation">,</span>
<span class="token property">&quot;ip&quot;</span><span class="token operator">:</span> <span class="token string">&quot;::1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;port&quot;</span><span class="token operator">:</span> <span class="token number">6500</span><span class="token punctuation">,</span>
<span class="token property">&quot;start&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-07-24T18:02:48.764685-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;last_activity&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-07-24T18:02:48.764685-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;uptime&quot;</span><span class="token operator">:</span> <span class="token string">&quot;6s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;idle&quot;</span><span class="token operator">:</span> <span class="token string">&quot;6s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;pending_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;name&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NCVS7Q65WX3FGIL2YQRLI77CE6MQRWO2Y453HYVLNMBMTVLOKMPW7R6K&quot;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token property">&quot;inbound_gateways&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token property">&quot;region2&quot;</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
<span class="token property">&quot;configured&quot;</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token property">&quot;connection&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token property">&quot;cid&quot;</span><span class="token operator">:</span> <span class="token number">9</span><span class="token punctuation">,</span>
<span class="token property">&quot;ip&quot;</span><span class="token operator">:</span> <span class="token string">&quot;::1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;port&quot;</span><span class="token operator">:</span> <span class="token number">52029</span><span class="token punctuation">,</span>
<span class="token property">&quot;start&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-07-24T18:02:48.76677-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;last_activity&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-07-24T18:02:48.767096-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;uptime&quot;</span><span class="token operator">:</span> <span class="token string">&quot;6s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;idle&quot;</span><span class="token operator">:</span> <span class="token string">&quot;6s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;pending_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;name&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NCXBIYWT7MV7OAQTCR4QTKBN3X3HDFGSFWTURTCQ22ZZB6NKKJPO7MN4&quot;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token property">&quot;region3&quot;</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
<span class="token property">&quot;configured&quot;</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token property">&quot;connection&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token property">&quot;cid&quot;</span><span class="token operator">:</span> <span class="token number">4</span><span class="token punctuation">,</span>
<span class="token property">&quot;ip&quot;</span><span class="token operator">:</span> <span class="token string">&quot;::1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;port&quot;</span><span class="token operator">:</span> <span class="token number">52025</span><span class="token punctuation">,</span>
<span class="token property">&quot;start&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-07-24T18:02:48.764577-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;last_activity&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-07-24T18:02:48.764994-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;uptime&quot;</span><span class="token operator">:</span> <span class="token string">&quot;6s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;idle&quot;</span><span class="token operator">:</span> <span class="token string">&quot;6s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;pending_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;name&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NCVS7Q65WX3FGIL2YQRLI77CE6MQRWO2Y453HYVLNMBMTVLOKMPW7R6K&quot;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>
<span class="token property">&quot;configured&quot;</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token property">&quot;connection&quot;</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token property">&quot;cid&quot;</span><span class="token operator">:</span> <span class="token number">8</span><span class="token punctuation">,</span>
<span class="token property">&quot;ip&quot;</span><span class="token operator">:</span> <span class="token string">&quot;127.0.0.1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;port&quot;</span><span class="token operator">:</span> <span class="token number">52026</span><span class="token punctuation">,</span>
<span class="token property">&quot;start&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-07-24T18:02:48.766173-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;last_activity&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-07-24T18:02:48.766999-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;uptime&quot;</span><span class="token operator">:</span> <span class="token string">&quot;6s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;idle&quot;</span><span class="token operator">:</span> <span class="token string">&quot;6s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;pending_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;name&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NCKCYK5LE3VVGOJQ66F65KA27UFPCLBPX4N4YOPOXO3KHGMW24USPCKN&quot;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="leaf-nodes-information"><a name="leaf-nodes-information" class="plugin-anchor" href="#leaf-nodes-information"><i class="fa fa-link" aria-hidden="true"></i></a>Leaf Nodes Information</h3>
<p>The <code>/leafz</code> endpoint reports detailed information about the leaf node connections.</p>
<p><strong>Endpoint:</strong> <code>http://server:port/leafz</code></p>
<table>
<thead>
<tr>
<th style="text-align:left">Result</th>
<th style="text-align:left">Return Code</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">Success</td>
<td style="text-align:left">200 (OK)</td>
</tr>
<tr>
<td style="text-align:left">Error</td>
<td style="text-align:left">400 (Bad Request)</td>
</tr>
</tbody>
</table>
<h4 id="arguments"><a name="arguments" class="plugin-anchor" href="#arguments"><i class="fa fa-link" aria-hidden="true"></i></a>Arguments</h4>
<table>
<thead>
<tr>
<th style="text-align:left">Argument</th>
<th style="text-align:left">Values</th>
<th style="text-align:left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">subs</td>
<td style="text-align:left">true, 1, false, 0</td>
<td style="text-align:left">Include internal subscriptions. Default is false.</td>
</tr>
</tbody>
</table>
<p>As noted above, the <code>leafz</code> endpoint does support the <code>subs</code> argument from the <code>/connz</code> endpoint. For example: <a href="http://demo.nats.io:8222/leafz?subs=1" target="_blank">http://demo.nats.io:8222/leafz?subs=1</a></p>
<h4 id="example"><a name="example" class="plugin-anchor" href="#example"><i class="fa fa-link" aria-hidden="true"></i></a>Example</h4>
<ul>
<li>Get leaf nodes information: <a href="http://demo.nats.io:8222/leafz?subs=1" target="_blank">http://demo.nats.io:8222/leafz?subs=1</a></li>
</ul>
<h4 id="response"><a name="response" class="plugin-anchor" href="#response"><i class="fa fa-link" aria-hidden="true"></i></a>Response</h4>
<pre class="language-"><code class="lang-json"><span class="token punctuation">{</span>
<span class="token property">&quot;server_id&quot;</span><span class="token operator">:</span> <span class="token string">&quot;NC2FJCRMPBE5RI5OSRN7TKUCWQONCKNXHKJXCJIDVSAZ6727M7MQFVT3&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;now&quot;</span><span class="token operator">:</span> <span class="token string">&quot;2019-08-27T09:07:05.841132-06:00&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;leafnodes&quot;</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token property">&quot;leafs&quot;</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
<span class="token property">&quot;account&quot;</span><span class="token operator">:</span> <span class="token string">&quot;$G&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;ip&quot;</span><span class="token operator">:</span> <span class="token string">&quot;127.0.0.1&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;port&quot;</span><span class="token operator">:</span> <span class="token number">6223</span><span class="token punctuation">,</span>
<span class="token property">&quot;rtt&quot;</span><span class="token operator">:</span> <span class="token string">&quot;200&#xB5;s&quot;</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_msgs&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_msgs&quot;</span><span class="token operator">:</span> <span class="token number">10000</span><span class="token punctuation">,</span>
<span class="token property">&quot;in_bytes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;out_bytes&quot;</span><span class="token operator">:</span> <span class="token number">1280000</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions&quot;</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token property">&quot;subscriptions_list&quot;</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token string">&quot;foo&quot;</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="subscription-routing-information"><a name="subscription-routing-information" class="plugin-anchor" href="#subscription-routing-information"><i class="fa fa-link" aria-hidden="true"></i></a>Subscription Routing Information</h3>
<p>The <code>/subz</code> endpoint reports detailed information about the current subscriptions and the routing data structure. It is not normally used.</p>
<p><strong>Endpoint:</strong> <code>http://server:port/subz</code></p>
<table>
<thead>
<tr>
<th style="text-align:left">Result</th>
<th style="text-align:left">Return Code</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">Success</td>
<td style="text-align:left">200 (OK)</td>
</tr>
<tr>
<td style="text-align:left">Error</td>
<td style="text-align:left">400 (Bad Request)</td>
</tr>
</tbody>
</table>
<h4 id="arguments"><a name="arguments" class="plugin-anchor" href="#arguments"><i class="fa fa-link" aria-hidden="true"></i></a>Arguments</h4>
<table>
<thead>
<tr>
<th style="text-align:left">Argument</th>
<th style="text-align:left">Values</th>
<th style="text-align:left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">subs</td>
<td style="text-align:left">true, 1, false, 0</td>
<td style="text-align:left">Include subscriptions. Default is false.</td>
</tr>
<tr>
<td style="text-align:left">offset</td>
<td style="text-align:left">integer &gt; 0</td>
<td style="text-align:left">Pagination offset. Default is 0.</td>
</tr>
<tr>
<td style="text-align:left">limit</td>
<td style="text-align:left">integer &gt; 0</td>
<td style="text-align:left">Number of results to return. Default is 1024.</td>
</tr>
<tr>
<td style="text-align:left">test</td>
<td style="text-align:left">subject</td>
<td style="text-align:left">Test whether a subsciption exists.</td>
</tr>
</tbody>
</table>
<h4 id="example"><a name="example" class="plugin-anchor" href="#example"><i class="fa fa-link" aria-hidden="true"></i></a>Example</h4>
<ul>
<li>Get subscription routing information: <a href="http://demo.nats.io:8222/subsz" target="_blank">http://demo.nats.io:8222/subsz</a></li>
</ul>
<h4 id="response"><a name="response" class="plugin-anchor" href="#response"><i class="fa fa-link" aria-hidden="true"></i></a>Response</h4>
<pre class="language-"><code class="lang-json"><span class="token punctuation">{</span>
<span class="token property">&quot;num_subscriptions&quot;</span><span class="token operator">:</span> <span class="token number">2</span><span class="token punctuation">,</span>
<span class="token property">&quot;num_cache&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;num_inserts&quot;</span><span class="token operator">:</span> <span class="token number">2</span><span class="token punctuation">,</span>
<span class="token property">&quot;num_removes&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;num_matches&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;cache_hit_rate&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;max_fanout&quot;</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token property">&quot;avg_fanout&quot;</span><span class="token operator">:</span> <span class="token number">0</span>
<span class="token punctuation">}</span>
</code></pre>
<h2 id="creating-monitoring-applications"><a name="creating-monitoring-applications" class="plugin-anchor" href="#creating-monitoring-applications"><i class="fa fa-link" aria-hidden="true"></i></a>Creating Monitoring Applications</h2>
<p>NATS monitoring endpoints support <a href="https://en.wikipedia.org/wiki/JSONP" target="_blank">JSONP</a> and <a href="https://en.wikipedia.org/wiki/Cross-origin_resource_sharing#How_CORS_works" target="_blank">CORS</a>. You can easily create single page web applications for monitoring. To do this you simply pass the <code>callback</code> query parameter to any endpoint.</p>
<p>For example:</p>
<pre class="language-"><code class="lang-sh">http://demo.nats.io:8222/connz?callback<span class="token operator">=</span>cb
</code></pre>
<p>Here is a JQuery example implementation:</p>
<pre class="language-"><code class="lang-javascript">$<span class="token punctuation">.</span><span class="token function">getJSON</span><span class="token punctuation">(</span><span class="token string">&apos;http://demo.nats.io:8222/connz?callback=?&apos;</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<h2 id="monitoring-tools"><a name="monitoring-tools" class="plugin-anchor" href="#monitoring-tools"><i class="fa fa-link" aria-hidden="true"></i></a>Monitoring Tools</h2>
<p>In addition to writing custom monitoring tools, you can monitor nats-server in Prometheus. The <a href="https://github.com/nats-io/prometheus-nats-exporter" target="_blank">Prometheus NATS Exporter</a> allows you to configure the metrics you want to observe and store in Prometheus. There&apos;s a sample <a href="https://grafana.com" target="_blank">Grafana</a> dashboard that you can use to visualize the server metrics.</p>
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