Azure Web Pubsub

Included skill

Azure Web Pubsub

Expert knowledge for Azure Web PubSub development including troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when building WebSocket/MQTT or Socket.IO apps, storage-backed chat, geo-replication, or Premium autoscale, and other Azure Web PubSub related development tasks. Not for Azure SignalR Service (use azure-signalr-service), Azure Service Bus (use azure-service-bus), Azure Event Hubs (use azure-event-hubs), Azure Relay (use azure-relay).

Source: /skills/azure-web-pubsub/SKILL.md

Azure Web PubSub Skill

This skill provides expert guidance for Azure Web PubSub. Covers troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. It combines local quick-reference content with remote documentation fetching capabilities.

How to Use This Skill

IMPORTANT for Agent: Use the Category Index below to locate relevant sections. For categories with line ranges (e.g., L35-L120), use read_file with the specified lines. For categories with file links (e.g., [security.md](security.md)), use read_file on the linked reference file

IMPORTANT for Agent: If metadata.generated_at is more than 3 months old, suggest the user pull the latest version from the repository. If mcp_microsoftdocs tools are not available, suggest the user install it: Installation Guide

This skill requires network access to fetch documentation content:

  • Preferred: Use mcp_microsoftdocs:microsoft_docs_fetch with query string from=learn-agent-skill. Returns Markdown.
  • Fallback: Use fetch_webpage with query string from=learn-agent-skill&accept=text/markdown. Returns Markdown.

Category Index

Category Lines Description
Troubleshooting L37-L47 Diagnosing and fixing Web PubSub errors, event handler/debug issues, service and Socket.IO problems, using resource/diagnostic logs and error codes for troubleshooting.
Best Practices L48-L52 Guidance on building resilient WebSocket clients for Azure Web PubSub, including reconnection strategies, handling disconnects, error handling, and connection lifecycle best practices.
Decision Making L53-L58 Guidance on choosing the right Web PubSub feature set for your scenario and understanding pricing, quotas, and cost drivers in the Azure Web PubSub billing model.
Architecture & Design Patterns L59-L65 Architectural patterns for Web PubSub: multi-region resiliency, bridging MQTT with WebSocket/Web PubSub, and understanding Socket.IO support internals for integration design.
Limits & Quotas L66-L71 Capacity and performance limits for Web PubSub (connections, messages, scaling) and which Socket.IO server APIs aren’t supported or behave differently.
Security L72-L103 Securing Web PubSub: authN/Z for chat, Socket.IO, MQTT; roles/permissions; Entra ID and managed identities; mTLS and WAF; keys/Key Vault; private endpoints, service tags, and network access controls.
Configuration L104-L120 Configuring Web PubSub instances: storage-backed chat, metrics/alerts, Azure Monitor, custom domains, event routing, geo-replication, client URLs, local tunneling, MQTT/Socket.IO options, and OData filters.
Integrations & Coding Patterns L121-L153 Client/server integration patterns for Web PubSub: SDK and REST usage, WebSocket/MQTT, JSON/protobuf subprotocols, events via CloudEvents/Functions, auth, and Socket.IO integration.
Deployment L154-L160 Guides for moving Web PubSub across regions, configuring Premium autoscale, and deploying/migrating Socket.IO apps and serverless chat to Azure Web PubSub.

Troubleshooting

Topic URL
Interpret Azure Web PubSub chat error codes https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-reference-errors
Debug Azure Web PubSub event handlers locally https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-local-debug-event-handler
Troubleshoot common Azure Web PubSub issues https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-troubleshoot-common-issues
Use Web PubSub resource logs for troubleshooting https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-troubleshoot-resource-logs
Resolve common Azure Web PubSub service issues https://learn.microsoft.com/en-us/azure/azure-web-pubsub/resource-faq
Troubleshoot Web PubSub for Socket.IO common issues https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-troubleshoot-common-issues
Collect diagnostic logs for Web PubSub Socket.IO https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-troubleshoot-logging

Best Practices

Topic URL
Design reliable WebSocket clients for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-develop-reliable-clients

Decision Making

Topic URL
Select the right Azure Web PubSub capability https://learn.microsoft.com/en-us/azure/azure-web-pubsub/choose-web-pubsub-capability
Understand Azure Web PubSub billing model https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-billing-model

Architecture & Design Patterns

Topic URL
Design resilient multi-region Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-disaster-recovery
Cross-protocol communication between MQTT and Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-mqtt-cross-protocol-communication
Internal design of Web PubSub for Socket.IO support https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-service-internal

Limits & Quotas

Topic URL
Plan Web PubSub performance and capacity https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-performance
Unsupported Socket.IO server APIs in Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-supported-server-apis

Security

Topic URL
Authenticate and issue tokens for Azure Web PubSub chat clients https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-howto-authenticate
Configure roles and permissions for Azure Web PubSub chat https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-howto-roles-permissions
Authorize Web PubSub access with Microsoft Entra ID https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-azure-ad-authorization
Configure wildcard group role permissions in Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-wildcard-group-roles
Authorize Azure Web PubSub requests with Microsoft Entra applications https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-authorize-from-application
Authorize Azure Web PubSub with managed identity https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-authorize-from-managed-identity
Enable client certificate (mTLS) for Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-client-certificate
Configure Azure Web PubSub Application Firewall for client control https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-configure-application-firewall
Create WebPubSubServiceClient in Java using Azure Identity https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-create-serviceclient-with-java-and-azure-identity
Create WebPubSubServiceClient in JavaScript using Azure Identity https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-create-serviceclient-with-javascript-and-azure-identity
Create WebPubSubServiceClient in .NET using Azure Identity https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-create-serviceclient-with-net-and-azure-identity
Create WebPubSubServiceClient in Python using Azure Identity https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-create-serviceclient-with-python-and-azure-identity
Disable key-based auth for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-disable-local-auth
Secure Web PubSub with Azure Application Gateway https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-integrate-app-gateway
Audit Azure Web PubSub compliance with Azure Policy https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-monitor-azure-policy
Manage Azure Web PubSub network access control rules https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-network-access-control
Secure Azure Web PubSub with private endpoints https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-private-endpoints
Rotate Azure Web PubSub access keys safely https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-rotate-access-key
Secure Web PubSub outbound traffic to Azure Functions via shared private endpoints https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-shared-private-endpoints
Access Key Vault privately from Azure Web PubSub via shared endpoints https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-shared-private-endpoints-key-vault
Secure Web PubSub outbound traffic to Private Link Service https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-shared-private-endpoints-private-link-service
Use Azure Web PubSub service tags for network access control https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-service-tags
Use managed identities with Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-use-managed-identity
Apply built-in Azure Policy definitions to Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/policy-definitions
Build serverless Web PubSub chat with client authentication https://learn.microsoft.com/en-us/azure/azure-web-pubsub/quickstart-serverless
Authenticate with Web PubSub for Socket.IO https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-authentication
Add authentication and permissions to Azure Web PubSub apps https://learn.microsoft.com/en-us/azure/azure-web-pubsub/tutorial-permission
Authenticate and authorize MQTT clients for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/tutorial-upstream-auth-mqtt-client

Configuration

Topic URL
Configure storage and enable Azure Web PubSub chat https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-howto-enable-chat
Use metrics and alerts for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-metrics
Configure monitoring for Azure Web PubSub with Azure Monitor https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-azure-monitor
Configure custom domains for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-custom-domain
Configure Azure Web PubSub event handlers and routing https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-develop-eventhandler
Enable geo-replication for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-enable-geo-replication
Generate client access URLs for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-generate-client-access-url
Reference for Azure Web PubSub monitoring metrics and logs https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-monitor-data-reference
Use Azure Web PubSub local tunnel for development https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-web-pubsub-tunnel-tool
CloudEvents extensions for Web PubSub MQTT handlers https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-mqtt-cloud-events
Write OData filter expressions for Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-odata-filter
Specification for Web PubSub Socket.IO Serverless Mode https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socket-io-serverless-protocol
Use Azure Socket.IO Admin UI for monitoring https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-troubleshoot-admin-ui

Integrations & Coding Patterns

Topic URL
Manage Azure Web PubSub chat rooms via SDK and REST https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-howto-manage-rooms
Send and manage messages in Azure Web PubSub chat https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-howto-messages
Use Azure Web PubSub chat SDKs and REST APIs https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-reference-sdk-and-rest
Connect MQTT and WebSocket clients to Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-connect-mqtt-websocket-client
Configure Azure Web PubSub client events to Event Hubs https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-develop-event-listener
Implement upstream servers for Azure Web PubSub events https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-web-pubsub-write-upstream-server
Create WebSocket clients https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-websocket-connect
Use C# client SDK for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-client-sdk-csharp
Use Java client SDK for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-client-sdk-java
Use JavaScript client SDK for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-client-sdk-javascript
Use Python client SDK for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-client-sdk-python
Follow Azure Web PubSub client specification https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-client-specification
Handle Web PubSub events via HTTP CloudEvents https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-cloud-events
Handle Web PubSub events via AMQP CloudEvents https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-cloud-events-amqp
Use Web PubSub triggers and bindings in Azure Functions https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-functions-bindings
Implement reliable JSON WebSocket subprotocol for Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-json-reliable-webpubsub-subprotocol
Use Azure Web PubSub JSON WebSocket subprotocol https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-json-webpubsub-subprotocol
Implement reliable protobuf WebSocket subprotocol for Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-protobuf-reliable-webpubsub-subprotocol
Use Azure Web PubSub protobuf WebSocket subprotocol https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-protobuf-webpubsub-subprotocol
Call Azure Web PubSub data plane REST APIs https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-rest-api-data-plane
REST API semantics for MQTT in Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-rest-api-mqtt
Use .NET server SDK for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-server-sdk-csharp
Use Java server SDK for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-server-sdk-java
Use JavaScript server SDK for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-server-sdk-js
Use Python server SDK for Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-server-sdk-python
Authenticate and connect to Azure Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/samples-authenticate-and-connect
Integrate Web PubSub for Socket.IO with API Management https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socket-io-howto-integrate-apim
Use Socket.IO Azure Functions triggers and bindings https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socket-io-serverless-function-binding
Integrate Web PubSub for Socket.IO into existing apps https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-quickstart

Deployment

Topic URL
Move Azure Web PubSub resources across regions https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-move-across-regions
Configure autoscale for Azure Web PubSub Premium https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-scale-autoscale
Deploy Socket.IO Serverless chat with Azure Functions https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socket-io-serverless-quickstart
Migrate self-hosted Socket.IO apps to Web PubSub https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-migrate-from-self-hosted